THE MUSCLES AND FASCIA OF THE UPPER EXTREMITY 



431 



glands and their ducts; the internal pudendal vessels and the dorsal nerves of the 

 clitoris; the arteries and nerves of the bulbi vestibuli, and a plexus of veins. 



The Transversus perinaei profundus arises from the inferior rami of the ischium 

 and runs across to the side of the vagina. The Sphincter urethrse membranacese 

 (Constrictor urethras), like the corresponding muscle on the male, consists of external 



Clitoris 



Sphincter ani externus 

 Fio. 408. Muscles of the female perineum. (Modified from a drawing by Peter Thompson.) 



and internal fibers. The external fibers arise on either side from the margin of the 

 inferior ramus of the pubis. They are directed across the pubic arch in front of 

 the urethra, and pass around it to blend with the muscular fibers of the opposite 

 side, between the urethra and vagina. The innermost fibers encircle the lower end 

 of the urethra. 



Nerve Supply. The muscles of this group are supplied by the perineal branch of the pudendal. 





THE MUSCLES AND FASCL35 OF THE UPPER EXTREMITY. 



The muscles of the upper extremity are divisible into groups, corresponding 

 with the different regions of the limb. 



I. Muscles Connecting the Upper Extremity to the Vertebral Column. 

 II. Muscles Connecting the Upper Extremity to the Anterior and Lateral 

 Thoracic Walls. 



III. Muscles of the Shoulder. V. Muscles of the Forearm. 



IV. Muscles of the Arm. VI. Muscles of the Hand. 



