7.1 Labium Majus/Female Urogenital Triangle

Question 1

Identify the labia majora. With what fascial layer is this continuous? Describe their tissue morphology.

Answer 1

Superficial Fatty Layer (Camper’s Fasica from abdomen).
Stratefied squamous epithelium (skin, with hair).
Filled with fat, smooth muscle, and terminal part of round ligament

Question 2

Describe the anterior/posterior labial commisures.

Answer 2

Where labia majora come together.

Question 3

Describe the mons pubis.

Answer 3

The rounded mass of fatty tissue lying over the joint of the pubic bones. More prominent in females.

Question 4

Identify and describe the labia minora.

Describe their tissue morphology.

Answer 4

-Folds of skin, medial to labia majora
o Form the prepuce & frenulum
o Vestibule = space between labia minora, containing the external meati of the urethra, vagina, and ducts of the greater and lesser vestibular glands
-The inner labia minora are lined by mucous membrane and do not exhibit any hair.

Question 5

Identify the clitoris. 
What innervates?
Arterial supply?
What fascial layers are associated?
Describe the following components:
-Glans
-Prepuce
-Body
-Crura
-Frenulum

Answer 5

-Innervation: Dorsal nerve of clitoris, from Pudendal (S2-S4)
-Arterial supply: Clitoral branch from Internal Pudendal a.
-Fascia: Superficial membranous layer (Colles) forms tubular sheath. Deep fascia forms suspensory ligament o clitoris.
-Components
Glans is inferior head
Prepuce is superior overlying skin
Body: proximal detached portion of clitoris
Rt and Lt Crus: 2 lateral erectile tissues of clitoris. attach to pubic arch and become the corpora cavernosa
Frenulum: fold formed by union of the labia minora on the undersurface of the clitoris.

Question 6

Identify the pudendal cleft

Answer 6

the space between the labia majora.

Question 7

Identify the Vaginal vestibule

Answer 7

the space between the labia minora.

Question 8

Identify the vaginal orifice and external urethral orifice

Answer 8

External openings of vaginal and urethra.

Question 9

Identify the perineal raphe.

Answer 9

extends from the posterior labial commissure to the anus posteriorly.

Question 10

Identify the bulbospongiosus muscle.

Describe the attachments/function and innervation.

Answer 10

• The bulbospongiosus runs anteriorly from the perineal body to the clitoris in females and to the penile raphe in males.
• The bulbospongiosus compresses the greater vestibular gland in females and assists in erection of the penis in males.
• Innervation: Pudendal nerve (S2 to S4).

Question 11

Identify and describe the greater vestibular gland.

Answer 11

Open into vestibule, posterolateral to vaginal orifice

Secrete lubricating mucus during sexual arousal

Question 12

Identify the Ischiovavernosus muscle.

Describe attachments/function, innervation, and arterial supply.

Answer 12

Paired muscles, covering crura.
Compress each crus.
Innervated by pudendal nerve. (S2-S4).
Arterial supply from perineal a.

Question 13

Identify the Superficial perineal fascia (Colle’s Fascia)

Answer 13

Found just under the fatty superficial fascia as you begin to remove the skin in this region.

Question 14

Identify the deep transverse perineal muscle.

Describe attachments, function, and innervation.

Answer 14

• The deep transverse perineal originates from the inferior pubic ramus and ischial ramus and inserts onto the wall of the vagina or the prostate as well as the perineal body (central tendon).
• The deep transverse perineal helps hold the perineal body and pelvic organs in place and supports the viscera passing through it.
• Innervation: Pudendal nerve (S2 to S4).

Question 15

Identify and describe the Perineal membrane.

Answer 15

separating membrane of the perineum. Dividing point between deep pouch and superficial pouch???

Question 16

Describe the perineal body

Answer 16

a knot of tissue that serves as an attachment point

Question 17

Identify Superficial transverse perineal muscles

Describe attachemnts, function, and innervation

Answer 17

• Form a ridge along the posterior border of the deep transverse perineal muscles.
• The superficial transverse perineal originates from the ischial ramus and inserts onto the perineal body (central tendon).
• Fxn: hold pelvic organs in place.
• Innervation: Pudendal nerve (S2 to S4).

Question 18

Identify the anterior recess of the ischioanal fossa

Answer 18

Under posterior border of the transverse perineal muscle–> anterior space filled with fat and CT.