Perineum

Question 1

Describe the location and general function of the perineum

Answer 1

Boundaries: Public symphysis, Ischiopubic rami, ischial tuberosities, sacrotuberous lig, sacrum/coccyx

Function: Supports openings from the pelvic floor

Question 2

Name the boundaries and contents of the female perineum

Answer 2

Surface anatomy: Mons pubis, labia minora and majora, clitoris, vaginal opening, urethral opening, anus

Question 3

Name the boundaries and contents of the male perineum

Answer 3

Penis, scrotum, anus

Question 4

Summarize the perineum and its muscles using a drawing

Answer 4

Draw

Question 5

Describe the general nerve supply to the perineum

Answer 5

Inf. Rectal nn.
Pudendal n.
Pudendal n. posterior labial/scrotal brr.
Dorsal clitoral/penile n.

Question 6

Describe the location of the erectile tissues of the male and female

Answer 6

Glans of clitoris/penis
Vestibular bulbs/corpus cavernosum of penis (covered by bulbospongiosus)
Crus of clitoris/penis (covered by ischio cavernosus)

Question 7

Describe the ischioanal fossa including contents

Answer 7

Fat pads and loose connective tissue surrounding the rectum to provide support. Located btwn levator ani and obturator internus. Pudendal canal located inferolaterally containing internal pudendal a. and v. and pudendal n.

Question 8

Describe the internal features of the scrotum

Answer 8

Skin > superficial fascia > tunica dartos > external spermatic fascia > cremasteric fascia and cremaster m. > internal spermatic fascia > tunica vaginalis parietal layer > testis w/ tunica vaginalis visceral lyer

Question 9

Describe the arterial supply of the perineum including its major branches

Answer 9

Ant division of internal iliac > internal pudendal a. > brr of internal pudendal a.

Femoral a. > external pudendal a. (to scrotum/labia)

Question 10

Describe the course and branches of the pudendal nerve

Answer 10

Draw

Question 11

Detail the components responsible for male erection and ejaculation

Answer 11

Parasympathetic (erection): parasympathetics of S2-4, cavernous nn. extensions of prostatic plexus.

Sympathetic (ejaculation): Sympathetics of L1-2, lumbar splanchnics to hypogastric plexus

Question 12

Explain the characteristics of the anal canal

Answer 12

From the pelvic diaphragm to the anus.

has internal and external (deep part, superficial part, subcutaneous part) sphincters