All Human Anatomy and Physiology Resources
Example Questions
Example Question #1 : Help With Evaluation Methods For The Nervous System
A patient comes has a drooping eyelid (ptosis). Upon elevation of the eyelid, it is observed that the eye looks down and out, the pupil is dilated, and there is loss of accommodation.
Which cranial nerve is damaged?
CN II
CN IV
CN V
CN III
CN VI
CN III
Cranial nerve (CN) III (oculomotor nerve) is responsible for certain eye movements. It innervates the following muscles: superior rectus, inferior rectus, medial rectus, and inferior oblique. It also functions in pupillary constriction, accommodation, and eyelid opening (via levator palpebrae). CN III is a motor nerve along with parasympathetic function. If there is injury to CN III these functions will be impaired leading to the presentation of the observations in the question stem.
Example Question #5 : Help With Evaluation Methods For The Nervous System
If a person cannot feel pain on the dorsal side of his/her right hand along the outer part of the hand including the little finger he/she likely has damage to the __________.
sciatic nerve
radial nerve
ulnar nerve
median cutaneous nerve
median nerve
ulnar nerve
The ulnar nerves serves the dorsal and palmar surfaces of the hand from the midline of the ring finger over to the little finger (dorsal and palmar).
Example Question #6 : Help With Evaluation Methods For The Nervous System
Which nerve supplies the deltoid muscle?
Radial
Musculocutaneous
Axillary
Ulnar
Median
Axillary
The axillary nerve supplies three muscles, the deltoid, teres minor, and the long head of the triceps. The deltoid is a muscle of the shoulder and teres minor is a muscle involved in the rotator cuff. The axillary nerve also supplies sensory information from the shoulder joint, and to the skin below the deltoid. The axillary nerve may be injured during an anterior dislocation of the shoulder joint or a fracture of the surgical neck of the humerus.
Example Question #7 : Help With Evaluation Methods For The Nervous System
Which nerve supplies the triceps brachii muscle?
Ulnar
Median
Musculocutaneous
Radial
Axillary
Radial
The radial nerve supplies the posterior portion of the upper limb. The radial nerve innervates the medial and lateral head of the triceps brachii muscle (the long head is supplied by the axillary nerve) and anconeus. The radial nerve originates from the brachial plexus and consists of fibers of nerves C5, C6, C7, C8, and T1.
Example Question #10 : Nervous System
The patellar (knee jerk) reflex tests which nerve root?
L2, L3, L5
L4
S1, S2
C5, C6
L2, L3, L5
The ankle jerk (Achilles) reflex tests the nerve root S1, S2. Biceps reflex tests roots C5, C6. Brachioradialis reflex tests C5, C6, C7. Triceps reflex tests C6, C7, C8 nerve roots. Patellar (knee jerk) reflex tests the L2, L3, L4 nerve roots.
Example Question #1391 : Human Anatomy And Physiology
Which cranial nerves (CN) are responsible for the pupillary light reflex?
CNs V and VII
CNs II and III
CNs IX and X
CN XII
CN V only
CNs II and III
The pupillary light reflex and ocular accommodation reflex involves cranial nerve II for the sensory aspect and cranial nerve III for the motor application. The jaw jerk reflex uses cranial nerve V for both sensory and motor. The corneal (blink reflex) utilizes cranial nerve V for sensory and VII for motor. The gag reflex utilizes cranial nerve IX for sensory and X for motor.
Example Question #21 : Injuries And Disorders
Which cranial nerves are responsible for the gag reflex?
CN X only
CNs II and III
CN V only
CNs V and VII
CNs IX and X
CNs IX and X
The gag reflex utilizes cranial nerve IX for sensory and X for motor. The pupillary light reflex and ocular accommodation involves cranial nerve II for the sensory aspect and cranial nerve three for the motor application. The jaw jerk reflex uses cranial nerve V for both sensory and motor. The corneal (blink reflex) utilizes cranial nerve V for sensory and VII for motor.
Example Question #22 : Injuries And Disorders
Which of the following is the nerve root for the sciatic nerve?
L3-L5
L2-L4
L4-S2
L4-S3
L4-S1
L4-S3
The sciatic nerve is a large nerve that runs through the buttocks and down the lower limb. The sciatic nerve innervates skin of the leg, and muscles in the posterior thigh, leg, and foot. The sciatic nerve is derived from spinal nerves L4-S3. The L4-S3 nerve root also supplies the tibial nerve.
L4-S1 is the nerve root for the superior gluteal nerve. Common fibular nerve is supplied by spinal nerves L4-S2. The obturator and femoral nerves are derived from L2-L4.
Example Question #23 : Injuries And Disorders
Which of the following is the nerve root for the femoral nerve?
L4-S2
L1-L4
L2-L4
L4-S3
L4-S1
L2-L4
The femoral nerve is a nerve in the thigh that innervates the skin on the upper thigh and inner leg and shin. It also innervates the muscles that extend the knee (quadriceps). It is the largest branch of the lumbar plexus and derives from spinal nerves L2-L4. The obturator nerve is also supplied by spinal nerves L2-L4.
The sciatic nerve is derived from spinal nerves L4-S3. The L4-S3 nerve root also supplies the tibial nerve. L4-S1 is the nerve root for the superior gluteal nerve. Common fibular nerve is supplied by spinal nerves L4-S2.
Example Question #24 : Injuries And Disorders
The ankle jerk (Achilles) reflex tests which nerve root?
L5, S1
S3, S4
C5, C6
L2, L3, L4
S1, S2
S1, S2
The ankle jerk (Achilles) reflex tests the nerve root S1, S2. Biceps reflex tests roots C5, C6. Brachioradialis tests C5, C6, C7. Triceps reflex tests C6, C7, C8 nerve roots. Patellar (knee jerk) reflex tests the L2, L3, L4 nerve roots. The hamstring reflex tests nerve roots L5 and S1.