Tablets of anatomy / by Thomas Cooke.

  • Cooke, Thomas.
Date:
1885
Catalogue details

Licence: Public Domain Mark

Credit: Tablets of anatomy / by Thomas Cooke. Source: Wellcome Collection.

    44/308 (page 34)
    THE MAMMA. .Rudimentary in the male, small in the female before puberty; increases in s'ze dnrm» pregnancy & after delivery. - Presei.ts : POSTERIOR SURFACE, or BASE — Somewhat concave; nearly circular, but slightly elongated from below upwards & outwards. Rests upon pectorab's major & fascia covering it, and extends from 3rd rib to the 6th or 7tb, and from side of sternum to axilla. ANTERIOR SURFACE — Presents, a little below its middle, the nipple surrounded by the areola. Nipple - Cylindrical or conical; presents at its apex tho openings of the lactiferous ducts. Its surface is of a pink or brownish hue, wrinkled, provided with papillae, and, near its base, with some sebaceous glands. It is susceptible of a sort of erection due mainly to the contraction of its muscular fibres. Areola -R°sy in the virgin; larger & darker in colour after the second month of pregnancy & during lactation (when its sebaceous glands enlarge consider- ably), and also somewhat so during the remainder of life. 1 CUTANEOUS NERVES. Cuperficial Descending - Several large branches from 3rd & 4th. Descend between sterno-mastoid & trapezius, and divide into branches- Sternal - Cross origin of sterno-mastoid to integument of front of chest as far as middle line. Clavicular - Cross clavicle (sometimes one of them perforates the bone) to integument over pectoralis major & deltoid, communicating with cuta- neous branches of the superior intercostal nerves. Acromial - Over acromion & clavicular origin of trapezius to integument of outer & back part of shoulder. Iiat^ral Cutaneous-Pierce intercostals & serratus magnus midway between vertebra* & sternum, and divide into : - iv Anterior Offset - Forwards to integument of side of chest mamma, and to 1 *v J[ i mJ. upper digitations of external oblique. *\/^*AA^ Posterior Offset - Backwards to integument over latissimus dorsi & scapula. Usfc The posterior offset of the lateral cutaneous branch of the 2nd y}/ j _ V intercostal nerve, is called the intercosto-humeral nerve. It crosses the ^p, axilla, joins with lesser internal cutaneous nerve or nerve of Wrisberg * Xf» 1 * * & with internal cutaneous branch of musculo-spiral, and pierces deep p. A J $f\AJLs* *\ fascia to integument of upper inner & back part of arm ; its size varies inversely with that of the nerve of Wrisberg. There is frequently a second intercosto-humeral nerve derived from the 3rd intercostal. Anterior Cutaneous-The termination of intercostal trunk. Pierce internal inter. costals & pectoralis major by side of sternum, and turn outwards to integu« ment of mamma & front of chest. The second joins with the clavicular branches of the superficial cervical plexus.