THE RABBIT. 343 



from the spines of the cervical vertebrae, and inserted with 

 the preceding muscle into the supra-scapular border. 



399. The serratus magnus (A, B, and C, sr.m), a 

 somewhat quadrate muscle arising from the third to ninth ver- 

 tebral ribs near their junctions with the sternal ribs by seven 

 slips which interdigitate with the external oblique : its fibres 

 pass upwards and forwards, and are inserted into the 

 supra-scapular border. 



400. The levator anguli scapulae (l.a.sc), a large 

 muscle arising from the transverse processes of the last five 

 cervical vertebrse, and passing backwards to be inserted into 

 the inner surface of the scapula close to its supra-scapular 

 border. 



401. The pectoral muscles have already been seen 

 (p. 290 131 '133); the insertion of the pectoralis 

 minor can now be conveniently made out : the muscle 

 passes dorsalwards, beneath (posterior to) the clavicle, into 

 which some of its fibres are inserted, and then spreads out 

 into a broad sheet which covers the anterior region of the 

 scapula, and is inserted into the pre-scapular fascia, 

 which invests the remaining muscles in the pre-scapular 

 fossa. 



402. The erector spinae, a complicated, longitudinal 

 muscle, forming with its fellow the ridge of the back, and 

 serving as the chief straightener of the vertebral column. 



403. The abductor brachii superior (a.br.s), a small 

 triangular muscle arising from the acromion, and inserted 

 into the deltoid ridge : detach from its origin and reflect. 



LIL Cut through the insertions of the pectoralis minor, 

 rhomboidei, serratus magnus, and levator anguli 

 scapulae: cut through the ligament joining the 

 clavicle to the scapula, and so detach the fore-limb 

 with the scapula from the trunk. Dissect crut : 



