Muscles Of The Medial Compartment Of The Thigh Flashcards Preview

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Flashcards in Muscles Of The Medial Compartment Of The Thigh Deck (21)
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1

What are the muscles of the medial compartment of the thigh?

Gracilis, obturator externus, adductor brevis, adductor longus and adductor magnus.

2

Innervation of the medial thigh muscles.

Obturator nerve, which arises from the lumbar plexus.

3

Arterial supply of the medial thigh muscles.

Obturator artery

4

Adductor Magnus

The adductor magnus is the largest muscle in the medial compartment. It lies posteriorly to the other muscles.

Functionally, the muscle can be divided into two parts; the adductor part, and the hamstring part.

5

Adductor Magnus attachments

Adductor part – Originates from the inferior rami of the pubis and the rami of ischium, attaching to the linea aspera of the femur.
Hamstring part – Originates from the ischial tuberosity and attaches to the adductor tubercle and medial supracondylar line of the femur.

6

Adductor Magnus actions

They both adduct the thigh. The adductor component also flexes the thigh, with the hamstring portion extending the thigh.

7

Adductor Magnus innervation

Adductor part is innervated by the obturator nerve (L2-L4), the hamstring part is innervated by the tibial component of the sciatic nerve (L4-S3).

8

Which muscle forms the medial border of the femoral triangle?

Adductor Longus

9

Adductor Longus Attachments

Originates from the pubis, and expands into a fan shape, attaching broadly to the linea aspera of the femur.

10

Adductor Longus Actions

Adduction of the thigh.

11

Adductor Longus Innervation

Obturator nerve (L2-L4).

12

The adductor brevis lies in between the anterior and posterior divisions.

Obturator nerve

13

Adductor Brevis Attachments

Originates from the body of pubis and inferior pubic rami. It attaches to the linea aspera on the posterior surface of the femur, proximal to the adductor longus.

14

Adductor Brevis Actions

Adduction of the thigh.

15

Adductor Brevis Innervation

Obturator nerve (L2-L4).

16

Obturator Externus Attachments

It originates from the membrane of the obturator foramen, and adjacent bone. It passes under the neck of femur, attaching to the posterior aspect of the greater trochanter.

17

Obturator Externus Actions

Adduction and lateral rotation of the thigh.

18

Obturator Externus Innervation

Obturator nerve (L2-L4).

19

Gracilis Attachments

It originates from the inferior rami of the pubis, and the body of the pubis. Descending almost vertically down the leg, it attaches to the medial surface of the tibia, between the tendons of the sartorius (anteriorly) and the semitendinosus (posteriorly).

20

Gracilis Actions

Adduction of the thigh at the hip, and flexion of the leg at the knee.

21

Gracilis Innervation

Obturator nerve (L2-L4).