1 SPINAL CORD ANATOMY AND DANIL HAMMOUDI.MD FUNCTION
3 SPINAL CORD ANATOMY
4 Lumbar Tap Figure 12.30
5 Spinal Cord Figure 12.29a
6 There are 31 spinal cord segments: 8 cervical segments 12 thoracic segments 5 lumbar segments 5 sacral segments 1 coccygeal segment There are two regions where the spinal cord enlarges: Cervical enlargement - corresponds roughly to the brachial plexus nerves, which innervate the upper limb. It includes spinal cord segments from about C4 to T1. The vertebral levels of the enlargement are roughly the same (C4 to T1). Lumbosacral enlargement - corresponds to the lumbosacral plexus nerves, which innervate the lower limb. It comprises the spinal cord segments from L2 to S3, and is found about the vertebral levels of T9 to T12.
8 Spinal Cord Conus medullaris terminal portion of the spinal cord Filum terminale fibrous extension of the pia mater; anchors the spinal cord to the coccyx Denticulate ligaments delicate shelves of pia mater; attach the spinal cord to the vertebrae
9 The dermatomes are somatic or musculocutaneous areas served by fibers from specific spinal nerves. Referred pain is caused when the sensory fibers from an internal organ enter the spinal cord in the same root as fibers from a dermatome. The brain is poor at interpreting visceral pain and instead interprets it as pain from the somatic area of the dermatome.
10 Cervical Plexus - the phrenic nerve travels through the thorax to innervate the diaphragm. Brachial Plexus - Axillary nerve - innervates the deltoid muscle and shoulder, along with the posterior aspect of the upper arm. Musculocutaneous nerve - innervates anterior skin of upper arm and elbow flexors. Radial nerve - innervates dorsal aspect of the arm and extensors of the elbow, wrist, and fingers, abduction of thumb. Median nerve - innervates the middle elbow, wrist and finger flexors, adducts the thumb. Ulnar nerve - innervates the medial aspect wrist and finger flexors. Lumbar Plexus genitofemoral - to the external genitalia obturator - to the adductor muscles femoral - innervates the skin and muscles of upper thigh, including the quadriceps. Sacral Plexus gluteal nerves (superior and inferior) - superior innervates the gluteus medius and minimus, inferior innervates the gluteus maximus. sciatic nerve - the body's largest nerve, consisting of two major branches, the tibial and common peroneal. Together they innervate most all of leg including the flexors of the knee, part of adductor magnus, muscles for plantar flexion, dorsiflexion, and other movements of the foot and toes.
11 ganglion - a collection of cell bodies located outside the Central Nervous System. The spinal ganglia or dorsal root ganglia contain the cell bodies of sensory neurons entering the cord at that region. nerve - a group of fibers (axons) outside the CNS. The spinal nerves contain the fibers of the sensory and motor neurons. A nerve does not contain cell bodies. They are located in the ganglion (sensory) or in the gray matter (motor). tract - a group of fibers inside the CNS. The spinal tracts carry information up or down the spinal cord, to or from the brain. Tracts within the brain carry information from one place to another within the brain. Tracts are always part of white matter. gray matter - an area of unmyelinated neurons where cell bodies and synapses occur. In the spinal cord the synapses between sensory and motor and interneurons occurs in the gray matter. The cell bodies of the interneurons and motor neurons also are found in the gray matter. white matter - an area of myelinated fiber tracts. Myelination in the CNS differs from that in nerves.
12 The spinal cord proper begins at the level of the foramen magnum of the skull and ends at the level of the L1ÐL2 intervertebral joint
24 a pia mater b subarachnoid space c dura mater d myelinated axon e unipolar neuron of the dorsal root ganglion surrounded by satellite cells (neuroglia).
25 a Pia mater b Subarachnoid space filled with cerebral spinal fluid, wastes and various cells. c Fibrocyte mixed in the blue collagen fibers of the dura mater. d Nucleus & nucleolus of unipolar neuron e Nucleus of one of many tiny satellite cells surrounding the large unipolar neuron. f Myelinated axon g Node of Ranvier h Nucleus of white Schwann cell
26 a Synaptic bulbs over the motor end plate - neuromuscular junction b Neuron axon terminal - black fibers
27 The central canal is the cerebrospinal fluid-filled space that runs longitudinally through the length of the entire spinal cord. The central canal is contiguous with the ventricular system of the brain.
28 PNS in the Nervous System Figure 13.1
31 Scheuermann kyphosis In some rare cases, the bones of the back (vertebrae) do not grow correctly. In Scheuermann kyphosis, the front part of the vertebrae does not grow as well as the back part.
32 Structure of a Nerve Nerve cordlike organ of the PNS consisting of peripheral axons enclosed by connective tissue Connective tissue coverings include: Endoneurium loose connective tissue that surrounds axons Perineurium coarse connective tissue that bundles fibers into fascicles Epineurium tough fibrous sheath around a nerve
35 Structure of a Nerve Figure 13.3b
36 Classification of Nerves Sensory and motor divisions Sensory (afferent) carry impulse to the CNS Motor (efferent) carry impulses from CNS Mixed sensory and motor fibers carry impulses to and from CNS; most common type of nerve
37 Peripheral Nerves Mixed nerves carry somatic and autonomic (visceral) impulses The four types of mixed nerves are: Somatic afferent and somatic efferent Visceral afferent and visceral efferent Peripheral nerves originate from the brain or spinal column
38 Regeneration of Nerve Fibers Damage to nerve tissue is serious because mature neurons are amitotic If the soma of a damaged nerve remains intact, damage can be repaired Regeneration involves coordinated activity among: Macrophages remove debris Schwann cells form regeneration tube and secrete growth factors Axons regenerate damaged part
39 Regeneration of Nerve Fibers Figure 13.4
40 Regeneration of Nerve Fibers Figure 13.4
41 Cranial Nerves Twelve pairs of cranial nerves arise from the brain They have sensory, motor, or both sensory and motor functions Each nerve is identified by a number (I through XII) and a name Four cranial nerves carry parasympathetic fibers that serve muscles and glands
42 Peripheral Nervous System 31 spinal nerves We ve already discussed their structure 12 cranial nerves How do they differ from spinal nerves? We need to learn their: Names Locations Functions
44 Cranial Nerves Figure 13.5a
45 Summary of Function of Cranial Nerves Figure 13.5b
46 12 Cranial Nerves How do you remember which nerve is which number? Here is a G-rated mnemonic devices: Old Opie occasionally tries trigonometry and feels very gloomy, vague, and hypoactive. There are also several R-rated ones Some cranial nerves are sensory, some motor, and some are both (mixed)? Some say marry money but my brother says big butts matter more.
48 Cranial Nerve I: Olfactory Arises from the olfactory epithelium Passes through the cribriform plate of the ethmoid bone Fibers run through the olfactory bulb and terminate in the primary olfactory cortex Functions solely by carrying afferent impulses for the sense of smell
49 Cranial Nerve I: Olfactory Figure I from Table 13.2
50 How many noses do you have? Sensory, motor, or mixed? Run from the nasal mucosa to the olfactory bulb. Extend thru the cribriform plate. Lesion to these nerves or cribriform plate fracture may yield anosmia loss of smell. CN1 Olfactory nerves
51 Cranial Nerve II: Optic Figure II from Table 13.2
52 How many eyes do you have? Sensory, motor, or mixed? Begin at the retina, run to the optic chiasm, cross over, continue as the optic tract and synapse in the thalamus. Optic nerve damage yields blindness in the eye served by the nerve. Optic tract damage yields partial visual loss. Visual defects = anopsias CN2 Optic Nerves
54 Cranial Nerve III: Oculomotor Fibers extend from the ventral midbrain, pass through the superior orbital fissure, and go to the extrinsic eye muscles Functions in raising the eyelid, directing the eyeball, constricting the iris, and controlling lens shape Parasympathetic cell bodies are in the ciliary ganglia
55 Cranial Nerve III: Oculomotor Figure III from Table 13.2
56 CN3 Eye mover Sensory, motor, or mixed? Originate at the ventral midbrain. Synapse on: Extraocular muscles Inferior oblique; Inferior, medial, and superior rectus Iris constrictor muscle Ciliary muscle Disorders can result in eye paralysis, diplopia or ptosis. Oculomotor Nerves
57 Cranial Nerve IV: Trochlear Fibers emerge from the dorsal midbrain and enter the orbits via the superior orbital fissures; innervate the superior oblique muscle Primarily a motor nerve that directs the eyeball
59 Controls the superior oblique muscle which depresses the eye via pulling on the superior oblique tendon which loops over a ligamentous pulley known as the trochlea. Originates on the dorsal midbrain and synapses on the superior oblique Sensory, motor, or mixed? Trauma can result in double vision. Why? CN4 Trochlear Nerves
61 Cranial Nerve V: Trigeminal Three divisions: ophthalmic (V 1 ), maxillary (V 2 ), and mandibular (V 3 ) Fibers run from the face to the pons via the superior orbital fissure (V 1 ), the foramen rotundum (V 2 ), and the foramen ovale (V 3 ) Conveys sensory impulses from various areas of the face (V 1 ) and (V 2 ), and supplies motor fibers (V 3 ) for mastication
62 Cranial Nerve V: Trigeminal Figure V from Table 13.2
63 CN5 Trigeminal Nerves Sensory, motor, or mixed? Biggest cranial nerve Originates in the pons and eventually splits into 3 divisions: Ophthalmic (V1), Maxillary (V2), & Mandibular (V3). Sensory info (touch, temp., and pain) from face. Motor info to muscles of mastication Damage?
66 The spinal trigeminal nucleus represents pain/temperature sensation from the face. Pain/temperature fibers from peripheral nociceptors are carried in cranial nerves V, VII, IX and X. On entering the brainstem, sensory fibers are grouped together and sent to the spinal trigeminal nucleus. This bundle of incoming fibers can be identified in cross sections of the pons and medulla as the spinal tract of the trigeminal nucleus, which parallels the spinal trigeminal nucleus itself. The spinal tract of V is analogous to, and continuous with, Lissauer s tract in the spinal cord.
67 Cranial Nerve VI: Abdcuens Fibers leave the inferior pons and enter the orbit via the superior orbital fissure Primarily a motor nerve innervating the lateral rectus muscle Figure VI from Table 13.2
68 Sensory, motor, or mixed? Runs between inferior pons and lateral rectus. CN6 Abducens Nerves
70 Cranial Nerve VII: Facial Cranial Nerve VII: Facial Fibers leave the pons, travel through the internal acoustic meatus, and emerge through the stylomastoid foramen to the lateral aspect of the face Mixed nerve with five major branches Motor functions include facial expression, and the transmittal of autonomic impulses to lacrimal and salivary glands Sensory function is taste from the anterior twothirds of the tongue
71 The facial nerve has four compo nents with distinc t functio ns: Branchial motor (special visceral efferent) Visceral motor (general visceral efferent) Special sensory (special afferent) Supplies the muscles of facial expression; posterior belly of digastric muscle; stylohyoid, and stapedius. Parasympathetic innervation of the lcrimal, submandibular, and sublingual glands, as well as mucous membranes of nasopharynx, hard and soft palate. Taste sensation from the anterior 2/3 of tongue; hard and soft palates. General sensory (general somatic afferent) General sensation from the skin of the concha of the auricle and from a small area behind the ear.
74 Branches of facial nerve in the face
76 Cranial Nerve VII: Facial Figure VII from Table 13.2
77 Sensory, motor, or mixed? Originates at the pons Convey motor impulses to facial skeletal muscles except for chewing muscles. Convey parasympathetic motor impulses to tear, nasal, and some salivary glands. Convey sensory info from taste buds on anterior 2/3 of the tongue. Facial nerve damage may yield Bell s palsy, total ipsilateral hemifacial paralysis CN7 Facial Nerves
79 CN8 Auditory/Vestibulocochlear Nerves Sensory, motor, or mixed? Originates at the pons 2 divisions: Cochlear Afferent fibers from cochlea in the inner ear HEARING Vestibular Afferent fibers from equilibrium receptors in inner ear BALANCE Functional impairment?
80 CN9 Glossopharyngeal Nerves Sensory, motor, or mixed? Fibers run emerge from medulla and run to the throat. Motor Functions: Motor fibers to some swallowing muscles Parasympathetic fibers to some salivary glands Sensory Functions: Taste, touch, heat from pharynx and posterior tongue. Info from chemoreceptors on the level of O 2 and CO 2 in the blood. Info from baroreceptors on BP. Chemoreceptors and baroreceptors are located in the carotid sinus a dilation in the internal carotid artery.
81 CN10 Vagus Nerves Sensory, motor, or mixed? Only cranial nerves to extend beyond head and neck. Fibers emerge from medulla, leave the skull, and course downwards into the thorax and abdomen. Motor Functions: Parasympathetic efferents to the heart, lungs, and abdominal organs. Sensory Functions: Input from thoracic and abdominal viscera; from baro- and chemoreceptors in the carotid sinus; from taste buds in posterior tongue and pharynx
83 CN11 Sensory, motor, or mixed? Formed by the union of a cranial root and a spinal root. CR arises from medulla while SR arises from superior spinal cord. SR passes thru the FM and joins with CR to form the accessory nerve. They then leave the skull via the jugular foramen. Cranial division then joins vagus and innervates larynx, pharynx, and soft palate. Spinal division innervates sternocleidomastoids and trapezius. Accessory Nerves
85 CN12 Hypoglossal Nerves Sensory, motor, or mixed? Arise from the medulla and exit the skull via the hypoglossal canal and innervate the tongue. Innervate the intrinsic & extrinsic muscles of the tongue. Swallowing, speech, food manipulation. Damage?
86 Peripheral Nervous System Now that we ve looked at spinal and cranial nerves, we can examine the divisions of the PNS. The PNS is broken down into a sensory and a motor division. We ll concentrate on the motor division which contains the somatic nervous system and the autonomic nervous system.
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