Lab Unit 14 - Peripheral And ANS

Question 1

ANTERIOR RAMI

Answer 1

Travel superiorly to supply the muscles of the upper and lower limbs, the anterior thorax and abdomen, and part of the back.

Question 2

What type of nerves are spinal nerves?

Answer 2

All spinal nerves are mixed nerves.

Question 3

How many pairs of spinal nerves are there?

Answer 3

31

Question 4

What are the 4 large plexuses?

Answer 4

1. Cervical plexus
2. Brachial plexus
3. Lumbar plexus
4. Sacral plexus

Question 5

Cervical plexuses consist of?

Answer 5

Anterior rami of C1-C4, with small contributions from C5.

Question 6

What does the cervical plexus serve?

Answer 6

Skin of the head and neck, and certain neck muscles. Major branch is the phrenic nerve.

Question 7

PHRENIC NERVE

Answer 7

Major branch of the cervical plexus, serves the diaphragm.

Question 8

Brachial plexus consists of?

Answer 8

Anterior rami of C5 - T1. Cords and trunks.

Question 9

Nerves that originate from brachial plexus?

Answer 9

1. Axillary nerve
2. Musculocutaneous nerve
3. Radial nerve
4. Ulnar nerve
5. Median nerve

Question 10

AXILLARY NERVE

Answer 10

Serves structures near the axilla, including the deltoid and teres minor muscles and the skin around this region.

Question 11

MUSCULOCUTANEOUS NERVE

Answer 11

Serves the anterior arm muscles that flex the forearm (such as the biceps brachii muscle) and the skin of the lateral forearm

Question 12

RADIAL NERVE

Answer 12

Serves the muscles that extend the forearm and hand as well as the skin in the lateral hand

Question 13

ULNAR NERVE

Answer 13

Supplies certain muscles in the forearm that flex the hand, most of the intrinsic muscles of the hand, and the skin over the medial hand.

Question 14

MEDIAN NERVE

Answer 14

Supplies most of the muscles of the forearm that flex the hand, certain intrinsic hand muscles, and the skin over the anterior and lateral hand.

Question 15

Lumbar plexus consists of?

Answer 15

Anterior rami of L1 - L4 with a small contribution from T12

Question 16

Nerves that originate from the lumbar plexus?

Answer 16

1. Iliohypogastric and ilioinguinal nerves
2. Genitofemoral nerve
3. Femoral nerve
4. Lateral femoral cutaneous nerve
5. Obturator nerve

Question 17

ILIOHYPOGASTRIC AND ILIOINGUINAL NERVES

Answer 17

Both supply motor interaction to the trans versus abdominis and internal oblique muscles and sensory to the pelvic area.

Question 18

GENITOFEMORAL NERVE

Answer 18

Supply the cremaster muscle in males and the skin around the anteromedial thigh and genitals in both sexes.

Question 19

FEMORAL NERVE

Answer 19

Largest nerve of the lumbar plexus. Provides motor interaction to most of the anterior thigh muscles that extend the knee and sensory innervation to the skin of the anterior and medial thigh. It gives off a large sensory branch called the saphenous nerve m, which supplies the knee joint, medial leg, and foot.

Question 20

LATERAL FEMORAL CUTANEOUS NERVE

Answer 20

Provides mainly sensory innervation to the skin of the anterolateral thigh.

Question 21

OBTURATOR NERVE

Answer 21

Located in the medial thigh, where it supplies the medial thigh muscles and the skin of the proximal, medial thigh.

Question 22

Sacral plexus consists of?

Answer 22

Anterior rami of L4 - S4.

Question 23

Nerves that originate from the sacral plexus?

Answer 23

1. Superior gluteal nerve
2. Inferior gluteal nerve
3. Pudendal nerve
4. Posterior femoral cutaneous nerve
5. Sciatic nerve

Question 24

SUPERIOR GLUTEAL NERVE

Answer 24

The first branch of the sacral plexus is the superior gluteal nerve, which supplies the gluteus medius, the gluteus minimus, and tensor fascia lata muscles.

Question 25

INFERIOR GLUTEAL NERVE

Answer 25

Supplies the gluteus maximus muscle

Question 26

PUDENDAL NERVE

Answer 26

Inner area the muscles of the pelvic floor and anogenital sphincters and provides sensory innervation to genitalia

Question 27

POSTERIOR FEMORAL CUTANEOUS NERVE

Answer 27

Located in the posterior thigh where it provides sensory innervation to the skin

Question 28

SCIATIC NERVE

Answer 28

The largest nerve of the sacral plexus and the largest nerve in the body. Splits into two branches: the tibial nerve and the common fibulae nerve, and gives off a small superficial sensory branch, the aural nerve.