True about serratus anterior
A. Laterally rotates the scapula.B. It is attached in the inner side of the scapula
C. Retraction of scapula.
D. Protracts the scapula.
E. It supports the clavicle.
Answer. A. Laterally rotates the scapula ; (B) It is attached to the inner side of
the scapula
(D) Protracts the scapula
;
* Serratus anterior muscle arises from
the upper ribs by eight digitations and
inserted into the
costal surface of scapula along the
medial border.
* Nerve to serratus anterior (C5, 6,7) supplies the muscle.
* Actions of serratus anterior
- Pull the scapula forwards around the
chest wall to protract it as a prime muscle in all reaching
and pushing movements (helped by
pectoralis minor)
- Rotates the scapula so that the
glenoid cavity is turned upwards. This help in reaching arm
above the head (helped by Trapezius)
- Steadies the scapula during weight
carrying.
- Helps in forced expiration.
