3. Muscles: Posterior Abdominal Wall

Question 1

Identify

Answer 1

1. Internal oblique muscle
2. Serratus anterior muscle
3. Rectus sheath
4. Rectus abdominis muscle
5. Conjoint tendon (inguinal falx) (both sides)

Question 2

Identify 5. How is it formed?

Answer 2

In the inguinal region, the aponeuroses of the internal abdominal oblique and transverse abdominal muscles fuse to form the conjoint tendon.

Question 3

identify

Answer 3

1. Cremaster muscle
2. External oblique muscle (cut away)
3. Internal oblique muscle
4. Rectus abdominis muscle
5. Pyramidalis muscle

Question 4

identify 1. O & I

Answer 4

1. Cremaster muscle
   * *Origin:** The thin cremaster muscle arises from the middle of the inguinal ligament and is a continuation of the internal oblique muscle.

Insertion: Attaches by a small tendon to the pubic tubercle and crest.

Question 5

identify 1. Action

Answer 5

1. Cremaster muscle
   * *Action:** Draws the testes upward.

Question 6

identify 1. Innervation

Answer 6

1. Cremaster muscle
   * *Innervation:** Genital branch of the genitofemoral nerve (L1 and L2).

Question 7

After passing through the ____, the muscle fibers of the cremaster form a series of loops that are embedded in the cremasteric fascia (surrounding the spermatic cord in a male).

Answer 7

inguinal ring

Question 8

After passing through the inguinal ring, the muscle fibers of the cremaster form (1)___ that are embedded in the (2)___

Answer 8

1. a series of loops
2. cremasteric fascia (surrounding the spermatic cord in a male).

Question 9

The spermatic cord is covered by 3 fascial layers derived from the ___

Answer 9

abdominal wall.

Question 10

The spermatic cord is covered by 3 fascial layers derived from the abdominal wall.

→ What are they?

Answer 10

1. The external spermatic fascia is derived from the external oblique aponeurosis
2. The middle spermatic (cremasteric) fascia, from the internal oblique muscle
3. The internal spermatic fascia, from the transversalis fascia.

Question 11

The spermatic cord is covered by 3 fascial layers derived from the abdominal wall.

1. The external spermatic fascia is derived from the ____
2. The middle spermatic (cremasteric) fascia, from the ___
3. The internal spermatic fascia, from the ___

Answer 11

1. external oblique aponeurosis
2. internal oblique muscle
3. transversalis fascia.