ZOOL 2403 Lecture Exam 2- Dr. Boros TTU Questions With 100% Correct Answers.

Root is to ____ as ganglion is to ___ - Answer-axons; cell bodies ventral is to ____ as dorsal is to _____ - Answer-motor; sensory white matter is to ____ as gray matter is to ____ - Answer-axons; cell bodies Spinal Meninges (three layers) - Answer-dura mater, arachnoid mater, pia mater Spinal Meninges functions - Answer-protect spinal cord and provide it with oxygen and nurtrients where is CSF - Answer-in subarachnoid space (between arachnoid and pia mater) CSF provides spinal cord with: - Answer-physical and chemical protection As you go down the spinal cord, the ____ white matter - Answer-less conus medullaris - Answer-caudal end of spinal cord; CNS cauda equina - Answer-spinal nerves inferior to conus medullaris; only contains axons; PNS divisions of spinal cord (CNS) - Answer-gray matter and white matter Gray Matter - Answer-composed of neuron cell bodies dorsal gray matter - Answer-cell bodies of sensory neurons receive and sum signals from PNS sensory neuronsventral gray matter - Answer-cell bodies of motor neurons receive and sum signals from brain motor neurons white matter - Answer-contains ascending and descending fiber (AXON) pathways ascending pathways - Answer-relays sensory info from spinal cord to brain descending pathways - Answer-relays motor info from brain to spinal cord spinal nerve divisions - Answer-dorsal root and ventral root dorsal root - Answer-contains axons cell bodies in dorsal root ganglion carry sensory info from peripheral receptors to spinal cord ventral root - Answer-contains axons cell bodies are in spinal cord carry motor info from spinal cord to muscles spinal nerves travel through ____ - Answer-intervertebral foramen spinal nerves are surrounded by ____ - Answer-connective tissue wrappings epineurium - Answer-outermost layer; surrounds entire spinal nerve; dense irregular CT perineurium - Answer-wraps axons into fasicles; dense irregular CT endoneurium - Answer-surround Shwann cell; loose CTlesion of spinal nerve= ____ nerves affected - Answer-sensory and motor lesion of dorsal root=___ axons affected - Answer-sensory lesion of ventral root= ___ axons affected - Answer-motor intercostal nerves innervate: - Answer-muscles of trunk skin of trunk spinal nerve plexus innervates - Answer-muscles of neck and limbs skin of neck and limbs cervical plexus innervates - Answer-muscles and skin of neck brachial plexus innervates - Answer-muscles and skin of pectoral girdle and upper limbs lumbrosacral plexus innervates - Answer-muscles and skin of pelvic girdle and lower limbs musculocutaneous nerve innervation - Answer-muscles of all anterior forearm--flexor skin of anterior forearm median nerve innervates - Answer-most muscles of anterior forearm--flexor skin of hand ulnar nerve innervates - Answer-most muscles of hand skin of hand radial nerve innervates - Answer-all muscles of posterior arm and forearm--extensorskin of posterior hand, arm and forearm axillary nerve innervates - Answer-muscles of shoulder skin of shoulder femoral nerve innervates - Answer-muscle of anterior thigh skin of anterior thigh obturator nerve innervates - Answer-muscles of medial thigh skin of medial thigh sciatic nerve innervates - Answer-muscles of posterior thigh, all leg and foot skin of posterior thigh, all leg and foot sciatic nerve branches into: - Answer-tibial and fibular nerves CNS composed of - Answer-brain and spinal cord interprets sensory info from PNS sends motor response to PNS - Answer-CNS deliver sensory info from receptors in skin and muscles to CNS deliver motor commands from CNS to muscles - Answer-PNS somatomotor nervous system - Answer-control skeletal muscle contractions autonomic nervous system - Answer-influence smooth and cardiac muscle contractions