ANP 1106 Lecture 13: Nervous System (Cranial and Spinal Nerves)

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jackie Carnegie

Document Summary

Spinal cord has only meningeal layer inner meningeal layer) Around brain, 2 layers fused except where enclose dural sinuses. Csf: pia mater: delicate ct and tiny blood vessels clings tightly to brain, follows convolutions. The spinal cord from foramen magnum to 1st/2nd lumbar vertebra, below this is ideal sport for lumbar puncture (to get spinal fluid) White matter myelinated and unmyelinated fibers, communication btwn different parts of cord and btwn cord and brain ascending, descending and transverse (commissural) tracts direction of fibers properties of spinal tracts: Most pathways cross over from one side of the cns to the other (decussate) Most consist of a chain of 2 or 3 neurons. Most exhibit somatotopy (mapping) all pathways and tracts are paired. Cranial nerves 12 pairs of cranial nerves pass through various foramina of the skull; first two pairs attach to forebrain, the rest originate from brains tem all except vagus nerve serve only head and neck structures.