Rnwk1- 4-14 Anatomy Perineal Myology/ Pelvic

Front 1

The most superficial muscles of the perineum are at what general location? What idp they all connect to?
What contents are in it? Fibers/Muscles

Back 1

All connect to perineal body in the midline between the Anal Canal and the Perineal Membrane, it contains Collagenous and Elastic Fibers and is the attachment point for the Bulbospongiosus M, External Anal Sphincter M., Superficial Transverse Perineal M. and Deep Transverse Perineal M. It is sometimes classified as a central tendon of the Pelvic and Urogenital Diaphragms.

Front 2

Superficial Transverse Perineal M.
1. origin
2. insertion
3. Action
4. innervation

Back 2

O: Ischiopubic Ramus and Ischial Tuberosity
I: Perineal Body
A: Support and fix Perineal Body, supports Abdominopelvic
Viscera and resists increases in Intraabdominal Pressure
N: Deep Perineal N.

Front 3

Ischiocavernosus M
1. origin
2. insertion
3. Action
4. innervation

Back 3

O: Ischiopubic Ramus and Ischial Tuberosity
I: Medial aspect of the Crus of the Penis (♂) or Clitoris (♀) and
Perineal Membrane medial to the Crura (B)
A: Maintain erection of Penis or Clitoris by compressing venous drainage, forcing blood from the Crura into the body of the Penis or Clitoris
N: Deep Perineal N.

Front 4

Bulbospongiosus M
1. origin
2. insertion
3. Action
4. innervation

Back 4

O: Median Raphe, ventral Bulb of Penis and Perineal Body (♂),
Perineal Body (♀)
I: Perineal Membrane, fascia of Bulb of Penis and Corpus Spongiosum and Corpora Cavernosa of the Penis (♂); fascia of Bulb of the Vestibule of Vagina, Pubic Arch and fascia of the Corpora Cavernosa of the Clitoris (♀)
A: Support and fix Perineal Body (B); compress Bulb of Penis,
assist erection by compressing venous drainage, forcing blood from the Root of the Penis to the Body of the Penis, expels final drops of Urine/ Semen from the Urethra (♂);
compresses Vaginal orifice, assist in erection of Bulbs of Vestibule of Vagina and compresses the Greater Vestibular Gland(♀)
N: Deep Perineal N.

Front 5

Describe the urogential diaphragm...
Separated by what muscles?

Back 5

(this muscle layer is described as being
deep to and separated from the Superficial Perineal muscles by the
Perineal Membrane; however, may contain elements of the Superficial
Perineal muscles and the Perineal Membrane)

Front 6

External Urethral Sphincter M. (Sphincter Urethrae M.)
1. origin
2. insertion
3. Action
4. innervation

Back 6

Made of compressor urethrae and urethrovaginal sphincter
O: Surrounds the Urethra
I: Surrounds the Urethra
A: Constrict Urethra maintaining urinary continence
N: Dorsal Nerve of the Penis (♂) or Clitoris (♀)

Front 7

Compressor Urethrae M. (extends laterally from the External Urethral Sphincter)
1. origin
2. insertion
3. Action
4. innervation

Back 7

O: Ischiopubic Ramus and Ischial Tuberosity
I: Median Raphe and Urethra via External Urethral Sphincter M.
A: Constrict Urethra maintaining urinary continence
N: Dorsal Nerve of the Penis (♂) or Clitoris (♀)

Front 8

Urethrovaginal Sphincter M. (♀; slips of the External Urethral
Sphincter M. that also surround the Vagina)
1. origin
2. insertion
3. Action
4. innervation

Back 8

O: Ischiopubic Ramus and Ischial Tuberosity
I: External wall of the Vagina
A: Compresses the Vagina
N: Dorsal Nerve of the Clitoris (♀)

Front 9

Deep Transverse Perineal M. (♂)
1. origin
2. insertion
3. Action
4. innervation

Back 9

Deep Transverse Perineal M. (♂)
O: Ischiopubic Ramus and Ischial Tuberosity
I: Median Raphe, Perineal Body and External Anal Sphincter
A: Support and fix Perineal Body, supports Abdominopelvic Viscera and resists increases in Intraabdominal Pressure
N: Deep Perineal N.

Front 10

Anal Muscles

Back 10

external anal sphincter and internal anal sphincter m

Front 11

Back 11

Front 12

Back 12

Front 13

External Anal Sphincter M.
1. origin
2. Insertion
3. Action
4. Nerve

Back 13

External Anal Sphincter M.
O: Skin and fascia surrounding Anus and Anococcygeal Body
I: Perineal Body
A: Constricts the Anal Canal during Peristalsis, resists Defecation,
supports and fix Perineal Body
N: Inferior Rectal N.

Front 14

Describe the pelvic diaphragm is made of four muscles... what are they?

Superficial fascia of the pelvic diaphragm also contains muscls that insert onto the urinary bladder...
What are these muscles

Back 14

the three Levator Ani Ms. (Puborectalis M., Pubococcygeus M., and Iliococcygeus M.) and the Coccygeus M.

1. Pubovsesicalis
2. Rectovesicalis

Front 15

Name the three levator ani m

Back 15

1. puborectalis M
2. Pubococcygeus M
3. illiococcygeus

Front 16

Puborectalis M
1. origin
2. Insertion
3. Action
4. Nerve

Back 16

(thick, narrow, medial most part of the Levator Ani)
O: Posterior aspect of the Pubic Body
I: External wall of the Rectum and Anal Canal
A: Maintain Anorectal Flexure, supports Pelvic Viscera, resists increases in Intraabdominal Pressure
N: Nerve to the Levator Ani M. (S4), Inferior Rectal N., branches of the Coccygeal Plexus

Front 17

Pubococcygeus M. (thin, wide, main part of the Levator Ani)
1. origin
2. Insertion
3. Action
4. Nerve

Back 17

O: Posterior aspect of the Pubic Body and anterior most part of the Tendinous Arch of Obturator Fascia
I: Coccyx, Anococcygeal Body, contralateral Pubococcygeus M.
A: Supports Pelvic Viscera, resists increases in Intraabdominal Pressure
N: Nerve to the Levator Ani M. (S4), Inferior Rectal N., branches of the Coccygeal Plexus

Front 18

Iliococcygeus M.
1. origin
2. Insertion
3. Action
4. Nerve

Back 18

Iliococcygeus M. (posterior, thin, poorly developed part of the
Levator Ani)
O: Posterior part of the Tendinous Arch of Obturator fascia and Ischial Spine
I: Coccyx and Anococcygeal Body
A: Supports Pelvic Viscera, resists increases in Intraabdominal Pressure
N: Nerve to the Levator Ani M. (S4), Inferior Rectal N., branches of the Coccygeal Plexus

Front 19

Coccygeus M.
1. origin
2. Insertion
3. Action
4. Nerve

Back 19

Coccygeus M.
O: Ischial Spine
I: Inferior Sacrum and Coccyx
A: Support Pelvic Viscera, flexes Coccyx
N: Nerve to the Coccygeus (S4,5; branches of the Coccygeal Plexus)

Front 20

Back 20

Front 21

Back 21

Front 22

Lateral pelvic wall muscles are?

Back 22

obturator internus and pirformis

Front 23

Piriformis M.
1. origin
2. Insertion
3. Action
4. Nerve

Back 23

O: Pelvic surface Sacral segments S2-S4, Greater Sciatic Notch and Sacrotuberous L.
I: Greater Trochanter of Femur
A: Rotate Thigh laterally, abduct Thigh, stabilize Femoral Head
in Acetabulum
N: Nerve to the Piriformis M.

Front 24

Obturator Internus M.
1. origin
2. Insertion
3. Action
4. Nerve

Back 24

O: Pelvic surfaces of the Ilium and Ischium and Obturator
Membrane
I: Greater Trochanter of the Femur
A: Rotate Thigh laterally, stabilize the Femoral Head in the
Acetabulum
N: Nerve to the Obturator Internus M.

Front 25

Back 25