Anatomy 10: Spinal Nerves/MSK Anatomy

Question 1

Sciatic Nerve

Answer 1

L4-S3

Supplying posterior thigh, all of leg

Question 2

Pudendal Nerve

Answer 2

S2-S4

Question 3

What is the action of the Posterior Thigh Muscles?

Answer 3

Extensors of thigh and flexors of leg

Question 4

Posterior Thigh Muscles

Answer 4

Semimembranosus
Semitendinosus
Biceps Femoris (long and short head)

Question 5

Why is the short head of biceps femoris not a “true”

Answer 5

Attaches at the Linea Aspera (not tibial tuberosity)

Does not cross hip joint

Supplied by common fibular branch, not tibial

Question 6

What is the action of the Anterior Thigh Muscles?

Answer 6

Flex the hip

Extend the leg

Question 7

Anterior Thigh Muscles

Answer 7

Pectineus, Iliacus and Sartorius (hip flexors)

Vastus lateralis, medialis, intermedius, rectus femoris (extensors of leg)

Question 8

Nerve supply to anterior leg

Answer 8

Femoral (L2,3,4)

Question 9

Action of the medial thigh muscles?

Answer 9

Adduct the hip

Question 10

Medial Thigh muscles

Answer 10

Adductor longus, brevis, magnus
Gracilis
Obturator externus

Question 11

Nerve supply to medial thigh muscles?

Answer 11

Obturator nerve (L2,3,4)

Question 12

Sensory innervation to the thigh

Answer 12

Anterior Cutaneous Nerve of the Thigh (branch of femoral nerve L2-4)

Lateral Cutaneous Nerve of the Thigh (lumbosacral plexus L2-L3)

Question 13

Nerve supply to anterior compartment of leg and first interdigital clef

Answer 13

Deep fibular nerve (L4,5)

Question 14

Nerve supply to lateral compartment of leg and dorsum of foot

Answer 14

Superficial fibular nerve (L5,S1,S2)

Question 15

What is the action of the posterior compartment of the leg?

Answer 15

Plantar flexors of the ankle

Deep group also flexors of the toes

Question 16

What are the superficial muscles of the posterior leg?

Answer 16

Gastrocnemius
Soleus
Plantaris

Question 17

What are the deep muscles of the posterior leg?

Answer 17

Popliteus
Flexor hallucis longus
Flexor digitorum longus
Tibialis posterior

Question 18

What are the superficial lymphatics of the lower limb?

Answer 18

Follow saphenous veins
Drain to superficial inguinal lymph nodes
Then external iliac lymph nodes

Question 19

What are the deep lymphatics of the lower limb?

Answer 19

Follow deep veins
Popliteal lymph nodes
Deep inguinal lymph nodes
External iliac lymph nodes

Question 20

What is the blood supply to the hip joint?

Answer 20

Medial and Lateral circumflex femoral arteries (from profunda femoris)
Artery to head of femur

Question 21

Arterial and venous supply to the posterior arm?

Answer 21

Profunda brachii artery

Profunda brachii vein

Question 22

What is the venous supply to the anterior and posterior forearm?

Answer 22

Venae comitantes

Question 23

What are the muscles of the anterior arm?

Answer 23

Biceps Femoris
Brachialis
Coracobrachialis

Question 24

What are the muscles of the posterior arm?

Answer 24

Triceps brachii

Question 25

Action of brachialis?

Answer 25

Flexor at elbow

Question 26

Where does Triceps Brachii attach?

Answer 26

To Olecranon of the ulna

Question 27

What is the main action of Biceps brachii?

Answer 27

Supination of the forearm

Question 28

The medial condyle is the common extensor T/F?

Answer 28

False, common flexor

Question 29

Palmar interossei....

Answer 29

ADduct the fingers at the MCP (PAD)

Question 30

Dorsal interossei....

Answer 30

ABduct the fingers at the MCP (DAB)

Question 31

What is the action of the superficial and deep gluteal muscles?

Answer 31

Superficial: ABduct and extend Deep: lateral rotators of thigh and hip stabilisers

Question 32

What is the most common ankle ligament injury?

Answer 32

Anterior Talofibular

Question 33

What is the Saphenous nerve a branch of?

Answer 33

Femoral (L3,4)