Practical anatomy: a manual of dissections / by Christopher Heath.

  • Christopher Heath
Date:
1870
Catalogue details

Licence: Public Domain Mark

Credit: Practical anatomy: a manual of dissections / by Christopher Heath. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

    497/600 (page 487)
    THE SERRATUS POSTICUS INFERIOR. 48t The posterior belly of the omo-hyoid is to be traced out to the scapula (p. 70), and the levator, rhoniboidei, and the upper half of the latissimus dorsi are then to be divided, when the scapula can be drawn away from the ribs and the posterior surface of the serratus magnus muscle with a quantity of loose cellular tissue between it and the ribs will be brought into view. This muscle is [to be studied again into relation and actions (p. 33), and then] to be divided by a vertical incision, and the clavicle being sawn through (if this has not already been done), the arm will be attached only by the vessels and nerves, which may be cut through and the limb removed. Between the rhomboidei and the serratus will be seen an artery, which is the posterior scapular. The dissector of the arm will proceed at once wdth the dissection of the scapular muscles (p. 67). The tendinous origin of the latissimus is then to be removed to expose the subjacent muscles. The Third Layer of Muscles (Fig- 224) consists of the Serratus posticus, superior and inferior, and the Sple- nius, which is divided into splenius capitis and splenius colli. The Serratus Posticus Superior arises from the liga- mentum nuchse and the spinous processes of the seventh cervical and upper two dorsal vertebra; and passes down- wards to be inserted into the superior borders of the upper four ribs, externally to their angles. The Serratus Posticus Infferior (Fig- 224, i6) arises from the spinous processes of the last two dorsal and upper two lumbar vertebrae; and passes upwards to be inserted into the lower borders of the last four ribs, external to their angles. The serrati postici are antagonistic muscles, the superior raising the ribs, and being therefore a muscle of inspira- tion, the inferior depressing the ribs, and being therefore a muscle of expiration. The serrati muscles are to be divided and turned aside, when the posterior portion of the fascia lumhorum (p. 128), covering the deeper muscles, and united more or less with the origins of the latis- simus dorsi and serratus posticus inferior as well as with the subjacent muscles, will be seen. The name of vertebral aponeurosis has been given to the continuation of this structure beneath the serratus posti- cus superior and over the deep muscles; this is to be defined and afterwards must be removed. The Splenius (Fig. 224) is single at its origin, which is from the lower half of the ligamentum nuchre and from the spinous processes of the seventh cervical and upper six dorsal vertebrae.