Group 5: Infrahyoid muscles. All but one of the infrahyo-id muscles are supplied by the ansa cervicalis of the cervical olexus (C1, C2, and C3). The exception is the thy-rohyoid, which is supplied by a branch of C1. (This branch of C1 also supplies the geniohyoid muscle).
New wordsneck – шея
cervical – цервикальный
vertebrae – позвоночник
cricoid cartilage – перстневидный хрящ гортани
scapulae – лопатка
scalene – лестничная мышца
brachial plexus – плечевое сплетение
vagus nerve – блуждающий нерв
hypoglossal nerve – подъязычный нерв
laryngeal branches – гортанные ветви
17. Thoracic wall
There are 12 thoracic vertebrae. Each rib articulates with the body of the numerically corresponding vertebra and the one below it. Sternum: the manubrium articulates with the clavicle and the first rib. It meets the body of the sternum at the sternal angel an important clinical landmark.
The body articulates directly with ribs 2–7; it articulates interiorly with the xiphoid process.
Ribs and costal cartilages: there are 12 pairs of ribs, which are attached posteriorly to thoracic vertebrae.
Ribs 1–7 attach directly to the sternum by costal cartilages.
Ribs 8 – 10 attach to the costal cartilage of the rib above. Ribs 11 and 12 have no anterior attachments. The costal groove is located along the inferior border of each rib and provides protection for the intercostal nerve artery, and vein.
There are 11 pairs of external intercostal muscles.
These muscles fill the intercostal spaces from the tubercles of ribs posteriorly to the costochondral junctions anteriorly. There are 11 pairs of internal intercostal muscles.
These muscles fill the intercostal spaces anteriorly from the sternum to the angles of the ribs posteriorly.