Human Anatomy and Physiology : Organs
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Example Questions
Example Question #171 : Organs
Which cranial nerve innervates the lateral rectus muscle of the eye?
Optic nerve
Trochlear nerve
Facial nerve
Abducens nerve
Abducens nerve
In this case, we are looking for a nerve with only motor function, leaving us with only the trochlear and abducens nerves. The trochlear nerve innervates the superior oblique muscle of the eye whereas the abducens nerve innervates the lateral rectus muscle, making the correct answer the abducens nerve.
Example Question #72 : Identifying Nerves And Blood Vessels
How many roots make up the brachial plexus?
7
3
6
5
5
The correct answer is 5 roots. They are roots C5-C8 and T1.
Example Question #74 : Identifying Nerves And Blood Vessels
Which of the following his not a trunk of the brachial plexus?
Inferior
Superior
Middle
Medial
Medial
The correct answer is medial. There are 3 trunks and they are named as follows: superior, middle, and inferior.
Example Question #72 : Identifying Nerves And Blood Vessels
Which of the following is not a cord of the brachial plexus?
Middle
Medial
Posterior
Lateral
Middle
The correct answer is middle. There are three cords and they are named as follows: lateral, medial, and posterior.
Example Question #73 : Identifying Nerves And Blood Vessels
Which of the following nerves branches off of the superior trunk of the brachial plexus?
Dorsal scapular nerve
Medial pectoral nerve
Thoracodorsal nerve
Suprascapular nerve
Suprascapular nerve
The correct answer is the suprascapular nerve. The thoracodorsal nerve, dorsal scapular nerve, and medial pectoral nerve branch off of the posterior cord, C5 root, and medial cord respectively.
Example Question #73 : Identifying Nerves And Blood Vessels
Which root(s) gives rise to the middle trunk of the brachial plexus?
C6 and C7
C7
T1
C5
C7
C7 gives rise to the middle trunk of the brachial plexus because it is the middle root. C5 and C6 are superior while C8 and T1 are inferior.
Example Question #651 : Gross Anatomy
How many divisions are found in the brachial plexus?
7
5
6
3
6
There are 6 division in the brachial plexus: 3 anterior of the superior, middle, and inferior trunks as well as 3 posterior of the superior, middle, and inferior trunks.
Example Question #652 : Gross Anatomy
Which of the following nerves does not branch off of the posterior cord of the brachial plexus?
Thoracodorsal nerve
Upper subscapular nerve
Long thoracic nerve
Lower subscapular nerve
Long thoracic nerve
The thoracodorsal nerve as well as the upper and lower subscapular nerves branch off of the posterior cord. This means the correct answer is the long thoracic nerve which branches off of the inferior trunk.
Example Question #651 : Gross Anatomy
Which of the following cranial nerves in both sensory and motor?
Oculomotor nerve
Glossopharyngeal nerve
Trochlear nerve
Vestibulocochlear nerve
Glossopharyngeal nerve
There are four cranial nerves that have both sensory and motor function. They are the trigeminal nerve, facial nerve, glossopharyngeal nerve, and vagus nerve. The glossopharyngeal nerve is responsible for general sensation, gustation, and baroreception. The motor fibers are used for swallowing. The trochlear nerve has only motor function (movement of the superior oblique), the oculomotor nerve has only motor functions (movement of the eye/pupil), the vestibulocochlear nerve has only sensory function (proprioception and audition).
Example Question #654 : Gross Anatomy
The ulnar nerve does not arise from which of the following roots?
T1
C8
C5
C7
C5
The correct answer is the C5 root. The ulnar nerve is the most inferior nerve in the brachial plexus, meaning it would not arise from a root like C5 which is the most superior in the brachial plexus.
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