Lab 4 - Peripheral Nervous System
The ventral horn of the spinal cord contains cells bodies of
**Motor (efferent) neurons** carrying impulses away from the spinal cord to the skeletal muscles
A dorsal root ganglion contains cell bodies of
**Sensory (afferent) neurons** from the skin to the spinal cord
How many pair of cervical nerves are there?
8
Which branch of the cervical plexus innervates the posterior part of the auricle of the ear
Lesser Occipital Nerve
Name the highlighted nerve that provides some of the innervation to joints of the hands.
Median nerve
Motor Innervation of adductor muscles in the leg
Obturator nerve
Sacral Plexus (3 nerves)
Sciatic nerve, Superior gluteal nerve, and tibial nerve
Dorsal rami of spinal nerves innervate
Skin and muscles of the back
Determine the nerves that demonstrate innervation of the teres major muscle
Subscapular nerve
Which nerve provides cutaneous innervation to the skin of the leg and the skin over the dorsum of the foot?
Superficial fibular nerve
Which nerve provides cutaneous innervation to the posterior, distal, and lateral proximal leg
Sural nerve
Which nerve innervates most of the intrinsic muscles of the hand, such as the hypothenar group, lumbricals 3 and 4, and all the interossei muscles?
Ulnar nerve
How many pair of sacral nerves are there?
5
How many pair of coccygeal nerves are there?
1
How many pair of thoracic nerves are there?
12
How many pair of spinal nerves are there?
31
How many pair of lumbar nerves are there?
5
A spinal nerve is formed by the union of
A dorsal and ventral root
What is the name of the highlighted structure, which translates as "neck loop" when deconstructed into its Latin roots?
Ansa cervicalis
Lumbar Plexus (2 nerves)
Femoral nerve & Obturator nerve
Identify the nerve which provides motor innervation to the cremaster muscle in males
Genitofemoral nerve
Which highlighted structure emerges from the cervical plexus and innervates the diaphragm?
Phrenic Nerve
Which nerve provides all motor innervation to the diaphragm?
Phrenic Nerve
Cervical Plexus (2 nerves)
Phrenic nerve & Ansa Cervicalis
Brachial Plexus (3 nerves)
Radial nerve, ulnar nerve, and median nerve
Ventral rami of spinal nerves innervate
lateral and ventral skin AND muscles of the trunk AND the skin of the limbs