SYNOPSIS OF MUSCULAR DISTRIBUTION OP NERVES. 625 



The sferno-mastoid is supplied by the spinal accessory nerve and a 

 twig of the cervical plexus coming from the second cervical nerve. 



The rectus capitis anticus major and minor are supplied by twigs from 

 the upper cervical nerves ; the lonrjus colli and sccdeni muscles by twigs 

 from the lower cervical nerves. 



The muscles of the chest, viz., the intercostals, subcostals, levatores 

 costarum, and triangularis sterni, are supplied by the intercostal 

 nerves. 



The oWqui, transversus, and rectus of the abdomen are supplied by 

 the lower intercostal nerves ; and the oblique and transverse muscles 

 also get branches from the ilio-inguinal and ilio-hypogastric nerves. 

 The cremaster muscle is supplied by the genital branch of the genito- 

 crural nerve. 



The quadratus lumlonnn (like the psoas) receives small branches 

 from the lumbar nerves before they form the plexus. 



The diaphragm receives the phrenic nerves from the fourth and fifth 

 cervical nerves, and likewise sympathetic filaments from the plexuses 

 round the phrenic arteries. 



The muscles of the vrethra and penis are supplied by the pudic nerve ; 

 the levator and sphincter ani by the pudic and by the fourth and fifth 

 sacral and coccygeal nerves ; and the coccygeus muscle by the three 

 last-named nerves. 



3. To muscles attaching the upper limb to the trunk. — The 



trapezius and the sterno-cleido-mastoid receive the distribution of the 

 spinal accessorg nerve, and, in union with it, filaments from the cervical 

 plexus. 



The latissimus dorsi receives the long subscapular nerve. 

 _ The rhomboidei are supplied by a special branch from the anterior 

 division of the fifth cervical nerve. 



The levator ancjuM scapulce is supplied by branches from the anterior 

 division of the third cervical nerve, and sometimes partly also by the 

 branch to the rhomboid muscles. 



The serratus magnus has a special nerve, the posterior thoracic, 

 derived from the fifth and sixth cervical nerves. 



The suMavius receives a special branch from the place of union of 

 the fifth and sixth cervical nerves. 



The pectoraks are supplied by the anterior thoracic branches of the 

 brachial plexus, the larger muscle receiving filaments from both these 

 nerves, and the smaller from the inner only. 



4. To muscles of the upper linib.— Muscles of the shoulder. — The 

 supraspinatus and infraspinatus are supplied by the suprascapular nerve ; 

 the subscapularis by the two smaller subscapular nerves ; the teres major 

 by the second subscapular, and the deltoid and teres minor by the cir- 

 cumflex nerve. 



Posterior muscles of the arm and forearm. — The triceps, anconeus, 

 supinator longus, and extensor carpi radialis longior are supplied by 

 direct branches of the musculo-spiral nerve ; while the extensor carpi 

 radialis brevier and the other extensor muscles in the forearm receive 

 their branches from the posterior interosseous division of that nerve. 



Anterior muscles of the arm and forearm. — The coraco-brachialis, 

 biceps, and brachialis anticus are supplied by the musculo-cutaneous 

 nerve ; the brachialis anticus likewise generally receives a twig from 

 VOL. I. s a 



