190lec10

190lec10 - HKIN 190: Anatomy and Physiology I 10 Spinal...

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10 – Spinal Cord Anatomy HKIN 190: Anatomy and Physiology I
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Tissue types in the body CMEN C onnective Tissue Blood Bone Cartilage Connective Tissue Proper M uscle Smooth Skeletal Cardiac E pithelial Squamous Cuboidal Columnar Pseudostratified Transitional N ervous
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Learning Objectives 1. To understand the gross anatomy of the spinal cord. 2. To understand the pathways of information through the spinal cord (into and out of the brain). Within this, to understand the direction of sensory versus motor pathways. 3. To understand reflexes. 4. To understand the levels of protection around the brain and spinal cord.
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1. Central nervous system (CNS) brain & spinal cord 2. Peripheral nervous system (PNS) all nerve tissue outside of brain & spinal cord Organization of the nervous system by location
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To understand the gross anatomy of the spinal cord. Learning Objective 1
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Spinal Cord divided into 5 sections: cervical (8 segments) thoracic (12 segments) lumbar (5 segments) sacral (5 segments) coccygeal (1 segment) pair of nerves from each segment C1 nerve exits above C1 vertebra C7 nerves exits above C7 vertebra C8 nerve exits above T1 vertebra T1 nerve exits below T1 vertebra
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Conus medullaris : end of spinal cord Filum terminale : pia mater extension Cauda equina : lumbar, sacral, and coccygeal nerve roots Spinal Cord At what level does the spinal cord end?
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posterior median sulcus anterior median fissure [ gray commissure posterior/dorsal nerve root anterior/ventral nerve root ventral horn (gray matter) dorsal horn (gray matter) Spinal Cord – cross section Note: Spinal nerve is mixed – both motor and sensory axons Question: What goes through the central canal?
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Spinal Cord – sensory in dorsal, motor out ventral
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Different segments of the spinal cord supply different parts of the body Dermatome – area of skin supplied by a given spinal segment Dermatomes
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Different segments of the spinal cord supply different parts of the body Myotome – group of muscles supplied by a given spinal segment Myotomes
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Herniated discs In the clinic, how do we test for this? Where is most common place? How does it happen? Demographic?
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Important plexuses and nerves Plexus: a network of interconnecting or interlacing blood vessels or nerves 1. Lumbar plexus (L1 – L5) Femoral nerve (L2 – L4) Obturator nerve (L2 – L4) 2. Sacral plexus (L4 – S5) Sciatic nerve (L4 – S3) 3. Brachial plexus (C5 – T1) Median nerve (C5 – T1) Radial nerve (C5 – T1) Ulnar nerve (C7 – T1)
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Lumbar plexus L1 to L5 Femoral Nerve: L2–4 •Quads •Skin ant thigh Obturator Nerve : L2-4 •Adductors •Skin groin Clinical Note : * Lateral cutaneous nerve of the thigh (“gunslinger’s syndrome”)
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Clinical Note: Sciatica (Sciatic nerve = L4 – S3) Sacral plexus
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190lec10 - HKIN 190: Anatomy and Physiology I 10 Spinal...

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