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Bassett Collection of Stereoscopic Images of Human Anatomy

Male external genitalia and perineum

Bulb of penis; central tendon of perineum

Image #167-2

KEYWORDS: Muscles and tendons.

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Male external genitalia and perineum
Bulb of penis; central tendon of perineum
The left bulbospongiosus muscle has been partially removed. The various insertions of the muscle, anteriorly into the suspensory ligament of the penis (14), onto the deep surface of the corpus spongiosum, and onto the perineal membrane (18), have been preserved. The central tendon of the perineum (6) is exposed in the midline posterior to the bulb of the penis. Transversely directed muscle fibers (10) that extend laterally from the central tendon may represent part of the superficial transverse perineal muscle, although they are seen to turn posteriorly to blend with fascia along the sphincter ani externus muscle.
1 . Corpus spongiosum of penis
2 . Right bulbospongiosus muscle (cut along midline raphe)
3 . Bulb of penis
4 . Upper pointer: Ischiocavernosus muscle Lower pointer: Crus of penis
5 . Ramus of ischium
6 . Central tendon of perineum
7 . External anal sphincter muscle (superficial part)
8 . Fibers of bulbospongiosus muscle (cut off close to origin)
9 . External anal sphincter muscle (deep part)
10 . Superficial transverse perineal muscle (small bundle of fibers that attaches to fascia alongside external anal sphincter)
11 . Levator ani muscle (puborectalis muscle)
12 . Inferior rectal artery
13 . Ischiorectal fossa
14 . Fibers of insertion of bulbospongiosus muscle (these pass into suspensory ligament of penis)
15 . Ischiocavernosus muscle (cut across)
16 . Inferior pubic ramus
17 . Crus of penis (indented by Ischiocavernosus muscle)
18 . Fibers of insertion of bulbospongiosus muscle (upper pointer, fibers passing to attach to upper surface of corpus spongiosum; lower pointer, fibers inserting on perineal membrane; also see no. 14.)
19 . Inferior fascia of urogenital diaphragm (perineal membrane)
20 . Perineal artery
21 . Ischial tuberosity
22 . Perineal nerve