Beneath the integument which is supplied by the inter-
costo-humeral nerve and by some of the lateral cutaneous
branches of the intercostals, is the superficial fascia in
which, when present, the superficial external mammary


The Axilla. 37


runs from the axillary artery towards the thorax. The
base of the axilla is completed by the deep fascia, which
is a strong dense layer called the.
‘Axillary fascia proper” and is formed by the
union of three planes of fascia; two prolonged from the
pectoralis major and one from the pectoralis minor, and
these three uniting, stretch across the base of the axilla
to the border of the latiss. dorsi muscle. The two layers
from the pectoralis major are the szperfictal and the deep
pectoral fascia, z.e., the one in front and the one behind
the pectoralis major. These, attached to the clavicle
above, are separated at their origin, by the pectoralis
major but are united below at the lower border of the
muscle. The layer of fascia from the lower border of the
pectoralis minor is the continuation downwards of the
clavipectoral fascia.
