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Anatomy 3 final (practical and oral part) > Practical topic 32 > Flashcards

Practical topic 32 Flashcards

Penis and its musculature, scrotum, testis, funiculus spermaticus, their nerves and blood supply

1
Q
  1. What are the main structures of the penis?
  2. What covers these structures?
A
  1. Penis consists of:
    • Root
    • Body
    • Glans
  2. The prepuce covering (some of) these structures
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2
Q

Prepuce

Parts

A
  1. Smooth internal layer
  2. Hairy external layer
  3. Fonix
    • Deepest recess
  4. M. protractor preputii
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3
Q

Prepuce

Blood supply

A

Branches of:

  1. A. penis dorsalis (anastomosing branches)
  2. A. pudenda externa (running in canalis inguinalis)
  3. A. bulbi penis
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4
Q

Prepuce

Innervation

A
  • N. penis dorsalis
    • Rr. preputalis (ex. n. pudenda)
  • N. genitofemoralis
    • N. cutaneous lateralis
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5
Q

Radix penis

A
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6
Q

Corpus penis

A
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7
Q

Glans penis

A
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8
Q

Give the muscles of the penis

A
  1. M. retractor penis
  2. M. ischocavernosus
  3. M. bulbospongiosus
  4. M. ishiourethralis

Mention:

  • M. urethralis
  • M. preputalis cranialis
  • M. preputalis caudalis
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9
Q

M. retractor penis

A

Origin: Ventral surface of sacrum (or first 2 caudal vertebrae)

Insertion: Blends with external anal sphincter, extends distally on ventral surface of penis at the level of the glans

Action: Retracts penis onto the prepuce

Innervation:

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10
Q

M. ischocavernosus

A

Origin:

  • Arcus ishiadica
  • Tuber ishiadicum

Insertion: Extends to the proximal end of corpus penis

Action:

  • Encloses crura
  • Raises erect penis (compresses the crura, erecting corpus cavernosus distally)

Innervation:

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11
Q

M. bulbospongiosus

A

Origin: Extrapelvic continuation of the striated m. urethralis

Insertion: Extends to the proximal end of the shaft of the penis

Action: Pulsatile contraction during ejaculation

Innervation:

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12
Q

M. ishourethralis

A

Originates from the dorsal part of tuber ishiadicum, and forms a fibrous ring around the common trunk of the left and right dorsal vein.

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13
Q

Give the layers of the scrotum

A
  1. Cutis scroti
  2. Tunica dartosa
  3. Fascia spermatica externa
  4. M. cremaster (fascia)
    • Origin: in m. obliquus abdominalis interna
  5. Fascia spermatica interna
    • Can’t really see
  6. Tunica vaginalis
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14
Q

Give the parts of the testis

A
  1. Extremitas capitata
  2. Extrimitas caudate
  3. Margo epididymalis
  4. Margo libre
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15
Q

Testis

Give the parts of the epididymis

A
  • Caput epididymis (head)
  • Corpus epididymis (body)
  • Cauda epididymis (tail)
    • Continuous with the ductus deferens
  • Bursa testicularis
    • Found between body of epididymis and testis
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16
Q

Funiculus spermaticus

What does it consist of?

A
  • AV. testicularis
  • Lymphatics
  • Testicular plexus of nerves
  • Smooth muscle
  • Ductus deferens
17
Q

Give the blood supply in this topic

A
  • A. penis
  • A. testicularis
  • V. testicularis
18
Q

A. penis

A
  • Ex. a. pudenda interna, ex. a. iliaca interna
  • Gives off:
    • A. bulbi penis
      • To corpus spongiosum penis
    • A. profunda
      • Through tunica albuginea and raifies in the corpus cavernosum
    • A. dorsalis penis
      • To the tip of the penis
19
Q

A. testicularis

A
  • Ex. aorta abdomialis (paired branches)
  • As a part of the spermatic cord, it reaches the testis
  • Gives off:
    • Rr. epididymales
20
Q

V. testicularis

A
  • Right:
    • Ex. vena cava caudalis
  • Left:
    • Enters renal vein, which then drains into vena cava caudalis
21
Q

Scrotum

Blood supply

A

A. pudenda externa → r. scrotalis + a. cremasterica to m. cremaster

22
Q

Testis

Blood supply

A
  • A. abdominalis → a. testicularis
  • V. testicularis → plexus pampiniformis
23
Q

Epididymis

Blood supply

A

A. testicularis

24
Q

Innervation

A
  • Paired pelvic (parasympathetic) and pudendal (mixed) nerves, from the lumbar and sacral plexus
  • Hypogastric nerves (sympathetic) from pelvic plexus
    • For ejaculation and prostatic secretion

Anatomy 3 final (practical and oral part) (128 decks)

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