Origins, Insertions & Actions of Selected Muscles
Which 3 muscles are included in the hamstrings group?
1. Biceps femoris 2. Semimembranosus 3. Semitendinosus
Which 4 muscles are included in the quadriceps group?
1. Rectus femoris 2. Vastus lateralis 3. Vastus intermedius 4. Vastus medialis
Orbicularis oculi
Action: Closes eyelids
Orbicularis oris
Action: Closes lips
Buccinator
Action: Compresses cheek to hold food in
Tibialis anterior
Action: Dorsiflexion of ankle (toes pointing upward)
Triceps brachii
Action: Elbow extension
Biceps brachii
Action: Elbow flexion and supination of forearm
Gastrocnemius
Action: Plantar flexion of the ankle (toes pointing downward)
Temporalis
Action: Raises mandible (chewing)
Rectus abdominis
Action: Rotation and flexion of vertebral column
Origin
Fixed attachment (e.g muscle to bone)
Insertion point
Moves with contraction (e.g. tendon to bone)
Vastus intermedius
Origin: Anterior and lateral femur Insertion: Tibial tuberosity and patella Action: Knee extension, hip flexion
Pectoralis major
Origin: Clavicle, sternum Insertion: Greater tubercle of humerus
Vastus lateralis
Origin: Greater trochanter, interochanteric line, and linea aspera Action: Knee extension, hip flexion
Sartorius
Origin: Iliac spine Insertion: Proximal tibia
Rectus femoris
Origin: Iliac spine, acetabulum Insertion: Tibial tuberosity and patella Action: Knee extension, hip flexion
Vastus medialis
Origin: Intertrochanteris line and linea aspera Insertion: Tibial tuberosity and patella Action: Knee extension, hip flexion
Semitendinosus
Origin: Ischial tuberosity Insertion: Medial condyle of tibia, lateral condyle of femur Action: Hip extension, knee flexion
Semimembranosus
Origin: Ischial tuberosity Insertion: Upper tibia Action: Hip extension, knee flexion
Biceps femoris
Origin: Ischial tuberosity, linea alba, and distal femur Insertion: Fibula and lateral condyleof tibia Action: Hip extension, knee flexion
Deltoid
Origin: Lateral clavicle, acromion process and spine of scapula Insertion: Deltoid tuberosity of humerus Action: Shoulder abduction
Sternocleidomastoid
Origin: Manubrium of sternum and clavicle Insertion: Mastoid process of temporal bone and occipital bone Action: Flexion of neck, rotation of head toward shoulder
Action
Particular movement of a muscle
