Origin: point of attachment close to the midline of the body/point of attachment of the muscle to the fixed bone

Insertion point A point of attachment away from the midline of the body/where a muscle attaches to a moving bone

Synergist muscles

antagonist muscle

Including masseter, temporalis, medial pterygoid, lateral pterygoid muscles

sternocleidomastoid muscle

platysma

anterior scalene muscle

middle scalene muscle

posterior scalene muscle

Starting point: Upper cervical line, external occipital protuberance, nuchal ligament, spinous process of seventh vertebra and spinous processes of all thoracic vertebrae

Insertion point: lateral 1/3 of the clavicle, scapular peak and scapular spine

Origin: spinous processes of lower thoracic vertebrae, thoracolumbar fascia, median sacral crest and posterior portion of iliac crest

Insertion point Lesser tuberosity ridge of humerus

Origin: Back of sacrum, posterior part of iliac crest muscle

Insertion point: The vertebrae, transverse processes, spinous processes and ribs continue upward and finally terminate at the mastoid process of the temporal bone.

Function: Unilateral contraction makes the spine lateral flexion, bilateral contraction makes the spine extend backward and the head tilts back.

chest and upper limb muscles

pectoralis propria

Location: Between the thorax and abdomen

Structural features central tendon

Function: Main calling muscle

3 holes

anterior group rectus abdominis

outer group

Houqun

Male spermatic cord

Female round ligament of uterus

deltoid muscle

brachial muscles

former group

Houqun

former group

Houqun

medial group

Back group - shallow layer