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Muscles
Identification
Muscle Name | Origin, 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 |