Male Perineum

Question 1

The Bony pelvis encloses

Answer 1

pelvic cavity

Question 2

What divides the bony pelvis into the “true” (surrounds the pelvic cavity) and “false” pelvis

Answer 2

Pelvic Inlet (or pelvic brim)

Question 3

The Pelvic Inlet is also known as…

Answer 3

the Pelvic Brim

Question 4

The floor of the pelvic cavity is called _______. It is covered by a muscular lining called _______. Below lies a diamond shaped region called ______.

Answer 4

Pelvic Outlet
Pelvic Diaphragm
Perineum

Question 5

The perineum is divided into

Answer 5

1. urogenital triangle (anteriorly)

2. Anal triangle (posteriorly)

Question 6

contains much of the male external genital structures

Answer 6

urogenital triangle

Question 7

contains anal canal and anus

Answer 7

Anal triangle

Question 8

The penis is divided into ____ and ____ regions

Answer 8

1. root

2. body

Question 9

The portion of the penis located in the superficial perineal space attached to the perineal membrane; consists of crura and bulb

Answer 9

root

Question 10

A part of root of the penis; erectile bodies attached to the ischiopubic rami

Answer 10

Crura

Question 11

A part of root of the penis; expanded body of erectile tissue b/w the crura

Answer 11

Bulb

Question 12

Each crus continues anteriorly and is now called _____ near pubic symphysis

Answer 12

corpus cavernosum

Question 13

Two corpus cavernosum fuse and is called

Answer 13

corpora cavernosa

Question 14

crura are covered by skeletal muscle called

Answer 14

ischiocavernosus muscle

Question 15

bulb is covered by skeletal muscle called

Answer 15

bulbospongiosus muscle

Question 16

Bulb continues anteriorly and is now called _____

Answer 16

corpus spongiosum

Question 17

The body of penis consists of

Answer 17

1. corpora cavernosa
2. corpus spongiosum
3. glans penis

Question 18

Main erectile body of the penis

Answer 18

corpora cavernosa

Question 19

Continuation of bulb; contains penile urethra and expands distally to form glans penis

Answer 19

corpus spongiosum

Question 20

Expanded distal end of corpus spongiosum forming the HEAD of the penis; has corona and external urethral orifice

Answer 20

glans penis

Question 21

Prominent margin of glans penis is _______.

Opening at the tip of the glans is ________.

Answer 21

corona; external urethral orifice

Question 22

Double fold of skin that extends from the neck of penis and covers the glans

Answer 22

prepuce (foreskin)

• this gets removed during circumcision

Question 23

Median fold of skin from prepuce to glans near the urethral orifice is called

Answer 23

frenulum

Question 24

a membranous layer deep to the skin that is continuous with Scapa’s fascia of the abdomen

Answer 24

Superficial (dartos) fascia

Question 25

a strong membranous layer that surrounds the three corpora of the penis like a sheath but doesn't extend into the glans

Answer 25

Deep Fascia (aka. Buck's fascia)

Question 26

Deep Fascia is aka

Answer 26

Buck's fascia

Question 27

Dense layer of connective tissue which surrounds each corpus cavernosum; deep to the DEEP (BUCK'S) FASCIA

Answer 27

Tunica albuginea

Question 28

Branches of what artery supply the deep penile structures?

Answer 28

internal pudendal artery

Question 29

arteries that course just beneath Buck's fascia and supply superficial structures

Answer 29

Dorsal penile arteries

Question 30

arteries that supply the erectile tissue and are responsible for ENGORGEMENT of the corpora cavernosa during erection

Answer 30

Deep penile arteries | aka. cavernous arteries

Question 31

Deep penile arteries is aka

Answer 31

cavernous arteries

Question 32

Veins that drain venous blood from the skin of penis and superficial structures

Answer 32

superficial dorsal veins

Question 33

superficial dorsal veins drain into

Answer 33

femoral vein

Question 34

the erectile bodies are drained by a single vein called

Answer 34

deep dorsal vein

Question 35

deep dorsal vein joins

Answer 35

prostatic venous plexus

Question 36

Superficial structures of the perineum (skin of the penis and skin of the scrotum) drain into what lymph node?

Answer 36

inguinal lymph nodes

Question 37

Deeper structures of the perineum (erectile tissues within the penis) drain into what lymph node?

Answer 37

iliac nodes

Question 38

Lymph from the erectile tissues (deeper structures) follows the course of

Answer 38

venous drainage

Question 39

Lymph from the testes drains into

Answer 39

lumbar (aortic nodes)

Question 40

The primary nerve of the perineum; has 3 branches

Answer 40

Pudendal nerve

Question 41

3 main branches of pudendal nerve

Answer 41

1. Inferior rectal (external anal sphincter) 2. Perineal nerve (sensory nerve to posterior scrotum) 3. Dorsal penile (sensory nerve to the penis) "I Prefer Dog"

Question 42

The penis is innervated by sensory fibers from what branch of pudendal nerve?

Answer 42

Dorsal Penile Nerve

Question 43

Besides Dorsal Penile Nerve, what nerve from the inferior hypogastric plexus carry PARASYMPATHETIC nerves in to the penis and are responsible for erection?

Answer 43

Cavernous nerves

Question 44

Extension of pelvic splanchnic (parasympathetic) nerves

Answer 44

Cavernous nerves

Question 45

Nerves that cause dilation of the blood vessels (deep penile arteries) within the erectile tissues of the penis, resulting in ENGORGEMENT and ERECT

Answer 45

Cavernous nerves

Question 46

Deep fascia of abdomen has an outer fatty layer called _____ and an inner membranous layer called ________, which both continue into the perineum.

Answer 46

Camper's fascia | Scarpa's fascia

Question 47

Scarpa's fascia in male continues on to the penis/scrotum and is now called

Answer 47

Darto's fascia

Question 48

Darto's fascia continues on to the perineum and is now called

Answer 48

Colles' fascia

Question 49

A tough fibrous sheet that extends between the ischiopubic rami within the UROGENTIAL triangle deep to colles' fascia; located b/w superficial and deep perineal space/pouch

Answer 49

perineal membrane

Question 50

forms a platform (floor) for the cavernous bodies (erectile tissues) and their associated muscles which become engorged during arousal

Answer 50

perineal membrane

Question 51

Ruptures of MEMBRANOUS urethra is almost always associated with

Answer 51

pelvic fractures

Question 52

Ruptures of MEMBRANOUS urethra can result in urine/blood extravasation in

Answer 52

DEEP perineal space

Question 53

Ruptures of SPONGY (BULBOUS) urethra is almost always associated with

Answer 53

straddle injuries

Question 54

Ruptures of SPONGY (BULBOUS) urethra can result in urine/blood extravasation in

Answer 54

SUPERFICIAL perineal space

Question 55

Superficial perineal space in the male contains root of the penis, hence contains

Answer 55

1. bulbospongiosus muscles and bulb 2. Ischiocavernosus muscles and crura 3. superficial transverse perineal muscles 4. pundendal nerve branches and internal pudandal vessels

Question 56

Deep perineal space in the male contains

Answer 56

1. Membranous urethra and external urethral sphincter 2. Bulbourethral glands (Cowper's) 3. pundendal nerve branches and internal pudandal artery 4. Deep transverse perineal muscles

Question 57

The majority of the perineum in the male is innervated by

Answer 57

pudendal nerve

Question 58

Sensory innervation to more anterior portion of the perineum/scrotum is innervated by

Answer 58

ilioinguinal and genitofemoral nerves

Question 59

The pudendal nerve and internal pudendal artery traverse through

Answer 59

pudendal (Alcock's) canal

Question 60

Erection is thought to be a (sympathetic/parasympathetic) response

Answer 60

Parasympathetic

Question 61

Parasympathetic stimulation via cavernous nerves from the pelvic splanchnics causes relaxation and dilation of ______ resulting in vascular engorgement and enlargement of erectile bodies

Answer 61

deep penile arteries aka. cavernous arteries

Question 62

Muscles of erectile bodies are innervated by _______ to maintain the erection

Answer 62

pudendal nerve

Question 63

Emission is thought to be a (sympathetic/parasympathetic) response

Answer 63

Sympathetic

Question 64

During emission, semen is delivered to the prostatic urethra via sympathetic stimulation of

Answer 64

vas (ductus) deferens

Question 65

Ejaculation is thought to be a (sympathetic/parasympathetic/somatic) response

Answer 65

all three but mainly SOMATIC

Question 66

Roles of the Sympathetic nerves during Ejaculation

Answer 66

- Symp: contract internal urethral sphincter (prevent retrograde ejaculation)

Question 67

Mnemonic for main phases of the sexual response

Answer 67

" Point Squeeze Shoot" 1. Erection --> Para 2. Emission --> Symp 3. Ejaculation --> Somatic (all three though)