ANAT 2626 Old Lecture Notes (Mercy Navis)

ANAT 2626 Old Lecture Notes (Mercy Navis) - 1 2626 Head &...

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1 2626 Head & Neck Structure of spinal nerve 31 pairs of spinal nerves are attached to the spinal cord a) 8 cervical b) 12 thoracic c) 5 lumbar d) 5 sacral e) 1 coccygeal nerves Dorsal root of the spinal nerve Arises from the dorsal surface of the cord, contains afferent ( sensory ) Fbers from the skin, subcutaneous and deep tissues and often from the viscera The cell bodies of somatic axons making up the ventral root are in the ventral gray horns Ventral root of the spinal nerve Arises from t he ventral surface of the cord, contains efferent ( motor ) Fbers to skeletal muscle and many contain presynaptic autonomic Fbers The cell bodies of axons making up the dorsal roots are in the spinal ganglion ( dorsal root ganglion ) Spinal nerve The dorsal and ventral roots unite at their points of exit from the vertebral canal to form the spinal nerve Each spinal nerve immediately divides into a dorsal primary ramus and a ventral primary ramus The dorsal ramus supplies the skin and true muscles of the back The ventral ramus supplies the limbs and the rest of the trunk In embryo, the spinal cord occupies the full length of the vertebral canal and in adults, the spinal cord is shorter than the vertebral canal ±unctional components of a typical spinal nerve Somatic Fbers General Somatic Afferent – GSA
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2 General sensory fbers transmit sensations From the body to the spinal cord They may be extroceptive sensations 1. pain, temperature, touch and pressure From the skin 2. pain and proprioceptive sensations From muscles, tendons and joints Proprioceptive sensations are unconscious sensations that convey inFormation on 1. joint position and the tension oF tendon 2. muscles providing inFormation on how the body and limbs are oriented in space General Somatic Efferent - GSE Somatic motor fbers transmit impulses to skeletal ( voluntary ) muscles Visceral sensory and motor Fbers General Visceral Afferent - GVA Visceral sensory fbers transmit re±ex or pain sensations From 1. mucous membranes 2. glands 3. blood vessels General Visceral Efferent - GSE Visceral motor Fbers transmit impulses Autonomic nervous system Innervates visceral organs including vascular and glandular systems ( visceral reFers to cardiac muscle, smooth muscle and glands ) It has two major parts 1. sympathetic system - includes prevetebral and paravertebral ganglia 2. parasympathetic system – includes the terminal ganglia Cranial nerves Olfactory nerve is the frst cranial nerve, its main action is smell From the nasal mucosa oF rooF oF each nasal cavity Optic nerve is the second cranial nerve, the special sensory nerve oF vision and is main action is the vision From the retina Oculomotor nerve is the third cranial nerve, motor nerve oF the eye Main actions
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3 Motor fbers to superior rectus, medial rectus, inFerior rectus, inFerior oblique and levator palpebrae superioris, raises the upper eyelid and turns the eyeball superiorly, inFeriorly and medially Parasympathetic innervation to sphincter ( constrictor ) pupillae and ciliaris muscles,
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This note was uploaded on 11/22/2011 for the course ANAT 2626 taught by Professor Ronaldg.mayne during the Winter '11 term at Life Chiropractic College West.

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ANAT 2626 Old Lecture Notes (Mercy Navis) - 1 2626 Head &...

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