This site is intended for healthcare professionals
General Practice Notebook
Medical search

serratus anterior (anatomy)

FREE subscriptions for doctors and students... click here
You have 3 open access pages.

On each side, serratus anterior is a large, broad sheet-like muscle which runs from thorax to scapula. Serratus in Latin means saw-like, the appearance of the anterior origin of the muscle.

It originates from several sites on the outer aspects of the first eight - occasionally nine - ribs between their respective angles and costal cartilages. The first 'digitation' or muscular slip is anomalous in that it arises from both the first and second ribs. The remaining digitations arise from a single rib and the intervening intercostal fascia. The lowest four digitations are interrupted by the costal attachments of the external oblique muscle of the abdomen.

All the digitations pass posteriorly over the side of the thorax. They cover the medial wall of the axilla then deep to the scapula to insert into its medial border. The upper two digitations fuse to insert into the upper angle of the scapula along this line; the lower four digitations converge on the inferior angle; the intermediate digitations insert into the intermediate space. Mobile fascia is sited both superficial and deep to the muscle to permit free movement.

Serratus anterior is innervated by the long thoracic nerve (C5, C6, C7); nerve damage or muscular weakness may cause a winged scapula - see submenu.

It has a variety of functions, the most important of which are protraction and lateral rotation of the scapula.

Links:

General Practice Notebook
General Practice Notebook
The information provided herein should not be used for diagnosis or treatment of any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions. Copyright 2016 Oxbridge Solutions LtdĀ®. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions LtdĀ® receives funding from advertising but maintains editorial independence. GPnotebook stores small data files on your computer called cookies so that we can recognise you and provide you with the best service. If you do not want to receive cookies please do not use GPnotebook.