Anatomy ch. 14
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The Spinal cord descends from the foramen magnum down to what skeletal landmark?
Describe the relationship between the white matter and the gray matter in the spinal cord.
.Gray matter: central
.White matter: Peripheral
What do we call the long dorsal and ventral roots of the spinal cord that extend beyond the conus medularis (conical tip at end of spinal cord)?
Anterior (ventral and posterior (dorsal) roots extend from the gray matter of the spinal cord into the intervertebral canal prior to joining and forming a spinal nerve.
what root of the spinal nerve carries outgoing motor information?
Anterior/ ventral root
what root of the spinal nerve carries incoming sensory information?
Posterior/ dorsal root
The gray matter of the spinal cord forms an H or butterfly shape. The different rgions have specific names and functions.
What do we call the areas of the gray matter that point in the anterior, lateral, and posterior directions and what neuron components are associated with each?
Anterior (ventral) horn: somatic motor cell bodies
Lateral horn: autonomic motor cell bodies
Posterior (dorsal) horn: interneuron cell bodies, axons of sensory (visceral/ somatic neurons)
Where are the cell bodies of the sensory neurons located?
Dorsal (posterior) root ganglia
What do we call the main branch of the spinal nerve that extends anteriorly or laterally to innervate the ventrolateral surface of the body, the body wall, and the limbs?
Ventral (anterior) ramus
What do we call the minor branch of the spinal nerve that extends posteriorly regions alongside the spine?
Dorsal (posterior) ramus
What minor branches of the spinal nerve (in the region from T1 to L2) carry signals to or from ganglia associated with the ANS?
Nerve plexuses are interwoven networks of ventral rami from spinal nerves.
What nerve plexus consists of ventral rami from spinal nerves C1- C4 and innervates such things as the shoulder and neck as well as the diaphragm?
What nerve from the Cervical Dietus (C3-C5) innervates the diaphragm?
What nerve plexus consists of ventral rami from spinal nerves C5- T1 and innervates such things as the upper limb, the pectoralis muscles and the latissimus dorsi muscle?
Name the major nerves of the brachial plexus.
What nerve plexus consists of ventral rami from spinal nerves T12- L4 and innervates such things as the abdominal muscles, genitalia, and the anterior and medial muscles of the thigh?
Name the major nerves of Lumbar plexus?
Femoral and obturator
What nerve plexus consists of ventral rami from spinal nerves L4- S4 and innervates such things as the skin and muscles of the crural region; the foot, and the posterior muscles of the thigh?
what never from the Sacral plexus (L4 - S3) is the larges and longest nerve in the body and innervates the hamstrings and all the crural muscles?
what do we call nerves that are formed from the ventral rami of T1-T12 that do not contribute to plexuses and innervate such things as the intercostals muscles, abdominal muscles, and skin of the chest and abdomen?
intercostal and subcostal nerves
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