64 Prof. A. Macalister on the Anatomy of the Derriah, 



ceal tendon of this muscle arises from that part of the flexor 

 mass which springs from the inner side of the olecranon. 



Pronator quadratus is bilaminar, the upper layer being tri- 

 angular, with the base at the ulna ; the deeper layer is also a 

 triangle with a radial base : the entire muscle occupies one 

 fourth of the ulna and one sixth of the radius. 



There is a large supinator longus, exactly equal to the pro- 

 nator teres (0*4 of an ounce). The extensor minimi digiti 

 supplies the fourth and fifth fingers. The indicator supplies 

 the second and third digits ; and there is no abductor minor 

 pollicis (extensor primi internodii pollicis). 



Palmaris brevis is very thick, and attached to the pisiform 

 bone. The abductor pollicis brevis is divided into two — a 

 weak external slip arising from the metacarpal bone, and an 

 internal stronger one from the trapezium. The flexor brevis 

 pollicis is also divided into two parts, both of which arise from 

 the annular ligament. A distinct opponens pollicis stretches 

 from the trapezium to the polliceal metacarpal ; and there is 

 an adductor from the middle metacarpal. The little finger 

 has three muscles — an abductor, an opponens, and a flexor. 

 The hand-interossei are as in man, as are the lumbricales. 

 The abductor pollicis major is mainly inserted into the trape- 

 zium, with a few fibres into the metacarpal. 



The psoas parvus is one seventh part of the psoas magnus, 

 which latter is inseparable from the iliacus. The adductors 

 are three, as usual ; and the pectineus is very small. The 

 gluteus maximus, agitator caudle, and tensor vaginae femoris 

 are inseparable, as also are the pyriformis and gluteus medius. 



The biceps femoris is ischiatic, and has only one head. 

 The semitendinosus is one third the size of the biceps, and 

 the semimembranosus is one fourth. The extensors of the 

 knee are to the flexors as 11*6 : 16*09. 



Plantaris is very large, and attached as usual. The flexor 

 digitorum muscle mainly supplies the second and fifth toes, 

 while the flexor hallucis supplies the first, third, and fourth 

 toes. The tibialis anticus has a double tendon, and is attached 

 to the internal cuneiform and metatarsal bone of the hallux. 



The peronseus longus has a sesamoid bone in its tendon. 

 The peronaeus brevis has a thread-like offshooting tendon, re- 

 presenting the peronseus quinti. There is a large pyriform 

 abductor minimi digiti. The flexor brevis digitorum has no 

 tendon to the fifth toe ; nor is there a lumbricalis for the second 

 toe ; the others are all bicipital. 



From the tendon of the flexor hallucis at the ankle there 

 arose a fleshy belly, which soon became tendinous ; and this 

 formed a head for the first lumbricalis, which was thus made 

 into a digastric muscle. 



