muscle of the shoulder and upper limbs. 1. the trapezius group 2. the deltoid group
TRANSCRIPT
Trapezius muscle group
Large superficial muscleOrigin:
Occipital bone and spinous process of thoracic vertebrae
Insertion: Clavicle and scapula
Action: on scapula
Trapezius muscle group (in cats)
1. Clavotrapezius Elevates and
retracts scapula Extends forearm
in forward motion
Three separate trapezius muscles in cat compared to one in human:
Trapezius muscle group (in cats)
2. Acromiotrapezius
Adducts the scapula
Three separate trapezius muscles in cat compared to one in human:
Trapezius muscle group (in cats)
3. Spinotrapezius Adduct scapula
and pulls it posteriorly
Three separate trapezius muscles in cat compared to one in human:
Deltoid muscle (in humans)
Origin: Spine of scapula
Insertion: Deltoid tuberosity of
humerusAction:
Shoulder abduction, flexion, extension, rotation
Deltoid muscle (in cats)
1. Clavobrachialis (aka clavodeltoid)
Flexes the forearm abduction
Three separate deltoid muscles in cat compared to one in human:
Deltoid muscle (in cats)
2. Acromiodeltoid Flexes the
humerus and rotates it outward
Three separate trapezius muscles in cat compared to one in human:
Deltoid muscle (in cats)
3. Spinodeltoid Acts in synergy
with acromiodeltoid
Three separate trapezius muscles in cat compared to one in human:
Levator Scapulae VentralisAction:
Elevates scapula
Origin: Transverse process
of first 4 cervical vertebrae
Insertion: Vertebral border of
scapula
Latissimus dorsi
Action: pulls forelimb dorsocaudally
Origin: last 6 thoracic vertebrae, all lumbar
vertebrae and iliac crest
Insertion: intertubercular groove of humerus