32 THE POCKET ANATOMY 



superior border of istrib, behind groove for subclavian artery 

 (F) (Branches of lower cervical). [A raises ribs as in forced 

 inspiration, B flexes spine laterally.] 



Scalenus posticus : posterior tubercles of transverse pro- 

 cesses of lower two or three cervical vertebrae(x) superior 

 border of 2nd rib(x) (Branches of lower cervical). [A raises 

 ribs, B flexes cervical spine laterally.] 



POSTERIOR VERTEBRAL REGION. 



Rectus capitis posticus major : spinous process of axis(T) 

 outer J inferior curved line of occiput and bone below(F) 

 (ist cervical, posterior primary division). [Extends head on 

 spine.] 



Rectus capitis posticus minor : posterior tubercle of neural 

 arch of atlas(T) inner part of inferior curved line of occiput 

 and bone between this and foramen magnum(F) (ist cervical, 

 posterior primary division). [Extends head on spine.] 



Obliquus inferior : spinous process of axis(p) transverse 

 process of atlas(T) (ist cervical, posterior primary division). 

 [Rotates face to same side.] 



Obliquus superior : superior surface of transverse process of 

 atlas(T) occipital bone, between the two curved lines(p) (ist 

 cervical, posterior primary division). [Rotates face to oppo- 

 site side.] 



MUSCLES AND FASCLE OF UPPER EXTREMITY. 



ANTERIOR THORACIC REGION. 



The deep fascia of the pectoral region covers the large 

 pectoral muscle, is attached above to the clavicle, internally 

 to the sternum, becoming continuous externally with fascia? 

 of shoulder, axilla, and lateral thoracic region. 



The costo-coracoid membrane, continuous with the deep fascia 

 of this part, is attached above to the clavicle so as to enclose 

 the subclavius muscle ; the posterior layer is continuous with 

 the axillary sheath derived from the deep cervical fascia. 

 The lower edge (costo-coracoid ligament) reaches from the 

 ist costal cartilage to the coracoid process, and passes down- 

 wards over pectoralis minor. It is pierced by cephalic vein, 

 acromio-thoracic vessels, and external anterior thoracic nerve. 



The axillary fascia is placed across the axilla; it is derived 

 in front from the sheaths of the pectoral muscles, and joins, 

 at the posterior border of the axilla, the sheaths of the latis- 

 simus dorsi and teres major. 



