Chapter 17 Homework
filum terminale
The pia mater that extends from the conus medullaris to the coccyx is the
spinal cord
Vertebrae and vertebral ligaments protect the ______________________.
dura mater, arachnoid mater, pia mater
From the most superficial to most deep, the spinal meninges are
subarachnoid space
Between the arachnoid mater and the pia mater is the ______________________.
lateral gray horns
Cell bodies of motor neurons that supply smooth muscle, cardiac muscle, or glands via the autonomic nervous system can be found in the
subarachnoid space
Cerebrospinal fluid is found between two layers of the meninges, in a space called the
rootlets
How is a spinal nerve connected to the spinal cord?
long thoracic
Injury of which nerve could cause paralysis of the serratus anterior muscle?
radial
Injury to this nerve, even from an intramuscular injection, could cause wrist drop. What is the name of this injured nerve?
sensory neurons; motor neurons
Nerve impulses from _____ travel along the posterior root of spinal nerves and nerve impulses from _____ travel along the anterior root of spinal nerves.
deltoid muscle
Select the structure(s) served by the axillary nerve. deltoid muscle extensors of the wrist flexors of the wrist biceps brachii diaphragm
flexors of the wrist
Select the structure(s) served by the median nerve. quadriceps femoris muscle extensors of the wrist flexors of the wrist skin of superior portion of the chest and shoulder diaphragm
triceps brachii
Select the structure(s) served by the radial nerve. deltoid muscle triceps brachii flexors of the wrist skin of superior portion of the chest and shoulder diaphragm
motor
The anterior (ventral) rootlets carry ___________ impulses to the spinal nerves.
gray commissure
The central canal of the spinal cord is located in the center of the:
meninges
The connective tissue coverings that surround the brain and spinal cord are called the ___________________.
epidural
The space between the dura mater and the wall of the vertebral canal, which is normally filled with a cushion of fat and connective tissue, is called the _________ space.
L1-L2
The spinal cord in the adult normally extends to which vertebral level?
vertebral column, meninges, cerebrospinal fluid
The spinal cord is protected by
spinal nerves
These structures allow input from sensory receptors and output to muscles and glands to communicate to and from the spinal cord. What are they called?
central canal
This structure contains cerebrospinal fluid within the spinal cord. What is it called?
C1-C3
Trauma to which segment of the spinal cord will disrupt breathing to the extent that a ventilator needed for breathing?
cell bodies of sensory neurons
What does a posterior (dorsal) root ganglion contain?
a
What is the correct order of events in a reflex arc? a) stimulus, sensory receptor, sensory neuron, integrating center, motor neuron, effector b) stimulus, nerve impulse, sensory neuron, motor neuron, effector c) effector, sensory receptor, integrating center, motor neuron, nerve impulse d) stimulus, sensory receptor, integrating center, motor neuron, effector
shoulders and upper limbs
Which area of the body is served by the brachial plexus?
posterior (dorsal) gray horns
Which of the following contain cell bodies of interneurons?
posterior (dorsal) root
Which of the following contains sensory information ONLY? anterior (ventral) root anterior (ventral) ramus posterior (dorsal) root posterior (dorsal) ramus
skeletal muscle
Which of the following could serve as an effector for a somatic reflex? skeletal muscle smooth muscle cardiac muscle gland
sciatic
Which of the following nerves is NOT from the brachial plexus? musculocutaneous radial axillary sciatic ulnar
denticulate ligaments, filum terminale
Which of the following structures help to anchor the spinal cord and protect it against sudden displacement?
anterior gray horn
Which region of the spinal cord contains clusters of cell bodies of somatic motor neurons?
pia mater
Which spinal meninx is deep to the subarachnoid space?
T2-T12
Which spinal nerves DO NOT participate in forming a plexus? C1-C5 C5-T1 T2-T12 L1-L4 L4-S4
white matter of the spinal chord
contains ascending (sensory) and descending (motor) tracts.
meninges
the ______________________ include the dura mater, arachnoid mater, and pia mater.
conus medullaris
the tapering end of the spinal cord inferior to the lumbar enlargement.