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Understanding Spinal Cord Anatomy & Function

Dive into the intricate structure and vital functions of the spinal cord, including spinal nerves, meninges, and autonomic control. Get insights on white and gray matter, reflex arcs, and more.

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Understanding Spinal Cord Anatomy & Function

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  1. Nervous System II • Spinal Cord and Spinal Nerves • Meninges and Cerebro-spinal fluid (CFS) • Autonomic Function

  2. Spinal Cord Cross Section

  3. Spinal Cord Cross Section(drawing on handout--showing reflex arc) • White matter (myelinated “tracts”) • Gray matter (cell bodies) • Ventral horn--motor neurons • Dorsal horn--interneurons for sensory • Dorsal Root--sensory • Ventral Root--motor • Spinal Nerve • Dorsal Ramus (to dorsal mm., skin) • Ventral Ramus (to ventral limbs mm., skin) • Dorsal Root Ganglion • Sensory Neuron • Somatic Motor Neuron

  4. Spinal nerve (cross section through thorax--on handout) • Dorsal Root Ganglion • Ventral root • Spinal Nerve • Dorsal Ramus • Ventral Ramus • (Where would you find the ventral ramus relative to the ribs) • (Look for lateral cutaneous nerves on your cat!!)

  5. Spinal Cord showing meninges

  6. What are meninges? • Connective tissues around spinal cord • For protection • For nutrition • Three layers • Pia mater • Arachnoid mater • Dura mater

  7. Pia mater (deep) • delicate • highly vascular • adheres to brain/sp cd tissue • Subarachnoid space (where CSF flows) • Arachnoid mater (middle) • impermeable layer = barrier • raised off pia mater by rootlets • Spinal Dura Mater • single dural sheath

  8. Sympathetic and Parasympathetic • Why double innervation? • Paraympathetic keeps “normal” rhythms, functioning--all calm • Sympathetic is “fight or flight” fear response

  9. How are Para/Sympa different?

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