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Muscles

Identification

Muscle NameOrigin, Insertions and Action
Orbicularis Oculi Origin- Frontal & Maxillary Bone Insertions- Eyelid Tissue Action- Blinking &Squinting
Orbicularis Oris Origin- Maxilla and Mandible Insertions- Muscles and skin at angles of mouth Action- Close lips, kissing, and whistling
Zygomaticus Origin- Zygomatic Bone Insertions- Muscles and skin at mouth corners Action- Smiling and Laughing
Buccinator Origin- Maxilla and Mandible Insertions- Orbicularis Oris Action- compress cheek, sucking
Platysma Origin- Fascia of the chest Insertions- Mandible and skin/muscle of Mouth Action- Depress mandible/tenses skin off neck during shaving
Masseter Origin- Zygotmatic Bone and maxilla Insertions- Mandible Action- Close jaw and elevates mandible
Temporalis Origin- Temporal Bone Insertions- Mandible Action- Closes jaw and elevates/retracts Mandible
Sternocleidomastoid Origin- Sternum and Clavicle Insertions- Temporal and Occipital Action- Rotate head toward opposite shoulder and neck flexion when both muscle contract
Pectoralis Major Origin- Sternum, clavicle, ribs, External Oblique muscle Insertions- humerus Action- Arm Flexion and forced inspiration
Pectoralis Minor Origin- Ribs Insertion- Scapula Action- Pulls scapula forward and inferior
Serratus Anterior Origin- Ribs Insertions- Scapula Action- abduction and raising of arm
Deltoid Origin- Clavicle and Scapula Insertions- Humerus Action- Abduction of Humerus
External Intercostals Origin- Ribs (Inferior Border) Insertions- Ribs (Superior Border) Action- Elevates ribs - aids in inspiration
Internal Intercostals Origin- Ribs (superior border) Insertions- Ribs (Inferior Border) Action- Lowers Ribs - aids in forced expiration
Rectus Abdominus Origin- Pubic Bone Insertions- Sternum - xiphoid groves and ribs Action- Fleves and rotates vertebral column
External Oblique Origin- Ribs Insertions- Linea alba, pubic crest and ilium Action- Flexes and rotates vertebral column
Latissimus Dorsi Origin- Thoracic and Lumbar Vertebrae, Ribs and Ilium Insertion- Humerus Action- Arm extension, adduction, and medial rotation of arm
Trapezius Origin- Occipital Bone, cervical and thoracic vertebrae Insertions- Scapula and Clavicle Action- Extends head, Shrug shoulders
Coracobrachialis Origin- Scapula Insertions- Humerus Action- Flexes and Abducts Humerus
Biceps Brachii Origin- Scapula Insertions- Radius - radial tuberosity Action- Flexes elbow joint, anatgonist of forearm extension
Brachialis Origin- Humerus Insertions- Ulna Action- Flexes elbow joint
Brachioradialis Origin- Humerus Insertions- Radius - styloid process Action- Flexes elbow joint
Triceps Brachii Origin- Scapula and Humerus Insertions- Ulna - olecranon Process Action- Extension at elbow joint, antagonist of forearm flexion
Supinator Origin- Humerus and ulna Insertion- Radius Action- Supinate forearm
Pronator Teres Origin- Humerus and ulna Insertions- Radius Action- pronates forearm
Sartorius Origin- Ilium - iliac spine Insertions- Tibia Action- Flex, abduct, and laterally rotate thigh. Helps with cross-legged position
Rectus Femoris Origin- Ilium - iliac spine and Acetabulum Insertions- Patella and tibia-tibial tuberosity Action- extends knee
Vastus Lateralis Origin- femur Insertions- Patella and Tibia-Tibial tuberosity Actions- Extends knees
Vastus Medialis Origin- femur Insertions- Patella and Tibia-Tibial tuberosity Actions- Extends knees
Vastus intermedius Origin- femur Insertions- Patella and Tibia-Tibial tuberosity Actions- Extends knees
Tensor Fasciae Latae Origin- Ilium-crest and Spine Insertions- Tibia Action- Flexes, abducts, and medially rotates thigh
Gluteus Maximus Origin- Ilium, sacrum, coccyx Insertions- Femur Action- Extends thigh (climbing stairs)
Gluteus Medius Origin- Ilium Insertions- Femur- greater trochanter Action- Abducts and medially rotates thigh (important walking)
Biceps Femoris Origin Femur and ischium Insertions- Tibia and fibula Action- Extends thighs and flexes knees
Semitendinosous Origin- Ischium - ischial tuberosity Insertions- Tibia Action- Extends thighs and flexes knees
Semimembranosus Origin- Ischium - ischial tuberosity Insertions- femur and tibia Action- extends thighs and flexes knees
Tibialis Anterior Origin- tibia Insertions- tarsal and metatarsal Action- Dorsiflexion
Gastrocnemius Origin- Femur Insertions- Calcaneus Action Plantar Flexion
Soleus Origin- Tibia and fibula Insertions- Calcaneus Action Plantar Flexion
Created by: Nouran_1218