10 terms

Nervous System Ex 21 (cont'd)

Use the disseced cat nervous system or the spinal cord model to identify. Pg 315/319
Spinal Cord
a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain
Cervical Enlargement/Expansion
superior enlargement of the spinal cord. Supplies nerves to upper limbs. Located approximately C4-T2. pg. 315
Lumbar Enlargement/Expansion
the inferior enlargement, extends from the ninth to the twelfth thoracic vertebra, nerves to and from the lower limbs arise form the lumbar enlargement. pg. 315
Cauda equina
"horse's tail", a fan of nerve fibers below the spinal cord. pg. 315
Conus Medullaris
Where spinal cord terminates at about L1-L2 in a cone shaped structure. pg. 315
Filum terminale
This structure is made up of pia mater that extends below the Cauda equina. It anchors the brain and spinal cord to the coccyx. pg. 315
Brachial plexus
network of nerve fibers that originates from the ventral branches of the last 4 cervical nerves and first thoracic spinal nerves, supplies shoulders, arms, and chest. pg 320-322
Sacral plexus
Arising from L4 through S4. supplies nerves to buttocks, perineum, and lower limbs. Sciatic nerve located here.
Vagus nerve
Cranial nerve X. Innervates organs such as the heart and intestines. 80-90% is afferent pathways. see pg 726 for location in cat.
Sciatic nerve
nerve extending from the base of the spine down the thigh, lower leg, and foot. Sciatica is pain or inflammation along the course of the nerve.. pg 709 for location in cat.