File:A treatise on practical anatomy- for students of anatomy and surgery (1891) (14748892436).jpg

Identifier: treatiseonpracti00boen (find matches)
Title: A treatise on practical anatomy: for students of anatomy and surgery
Year: 1891 (1890s)
Authors: Boenning, Henry C
Subjects: Anatomy
Publisher: Philadelphia and London, F. A. Davis
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Urin^. Orhjin—A bipenniform muscle, from central tendonof perineum in front of anus; the tendon lies be-neath the urethra, in the median line.Insertion—The muscular fibres curve around the ure-thra, encircle the bulb, and are lost on its uppersurface.Nerve—Perineal.Erector Penis. Origin—Inner border of ascending ramus of ischium and ramus of pubes.Insertion—Ends in aponeurosis, which is inserted into the side and under surface of crus penis.Nerve—Perineal.Transversus Perin^i. Origin—Inner surface of tuberosity of ischium.Insertion—Passes inward and forward, and is insertedon the central tendon of perineum just anterior tothe anus.Nerve—Perineal.Levator Ani. Origin—Attached to the inner sides of the true pelvis, 280 PRACTICAL ANATOMY. arises from posterior surface of body of pubes, spineof ischium, and obturator ligament, extending fromspine of ischium to posterior surface of pubes. ThisUgament is formed by the junction of the obturatorwith the recto-vesical fascia.
Text Appearing After Image:
Fig. 103.—MrscLES of the Perineum. Insertion—Into coccyx and sides of rectum andsphincter, side of prostate gland; it forms a sling,which supports the pelvic viscera. Nerve—Perineal.Compressor Urethra. Origin—From border of ramus of pubes, and passesdown and surrounds the membranous urethra. Nerve—Perineal. MUSCLES OF PERINEUM AND rSCHIO-RECTAL REGION. 231CORRUGATOR CUTIS Ani. Origin—Subcutaneous fibres of muscular tissue, largely involuntary, which wrinkle the skin around the anus.Insertion—Skin around anus.Nerve—Perineal,External Sphincter Ani. Origin—Plane of muscular fibres subcutaneous and attached to the skin; arises from tip of coccyx.Insertion—Tendinous centre of perineum after ellip- tically surrounding the anus.Nerve—Fourth sacral.Internal Sphincter Ani. Origin—A ring of muscle around the lower end of the rectum, about one-fourth of an inch thick, tliree- fourths to one and one-half inches wide.Insertion—Is a mixture of voluntary and involuntary fib

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