Lateral Pterygoid You need to dissect the mandible in order to see this Works with medial pterygoid to lower the mandible and open the jaw This is a deep muscle Rectus Abdominis Flexes lumbar portion of vertebral column External Obliques Individual: lateral flexion and rotation of vertebral column Together: Flexes vertebral column and compresses abdominal wall Internal Obliques Individual: lateral flexion of vertebral column and rotation of vertebral column to opposite side Together: Flexes vertebral column and compresses abdominal wall Transversus Abdominus
Individually: lateral flexion of vertebral column Together: Flexes andcompresses vertebral column Medial Pterygoid Origin: Lateral pterygoid plate of sphenoid
Insertion: Ramus of the mandible Action: Close jaw; lateral excursion Gluteus Medius Origin: Upper lateral portion of ilium
Insertion: Lateral part of the greater trochanter Action: Abducts and medially rotates the hips Sartorius Origin: Anterior, superior spine of the ilium
Insertion: medial surface of the tibia Action: Flexes, abducts, and laterally rotates the hip; flexes the knee. Adductors Longus Origin: Pubis Insertion: Linea aspera of femur
Action: Adducts hip; flexes knee Adductor Magnus Origin: Pubis Insertion: Linea aspera of femur
Action: Adducts hip; flexes knee Sternocleidomastoid: if tone side contracts it rotates and tilts thehead sideways; if both side contract it draws the head forward anddown; flexes neck Gracilis: adducts hip; flexes knee Rectus Femoris: flexes hip (femur); extends knee Vastus medialis: extends knee Vastus lateralis: extends knee Masseter: closes jaw (elevates and retracts mandible) Digastricus: opens the mouth (lowers mandible), elevates and holds hyoid during speech and swallowing Gluteus maximus: extension and lateral rotation of hip (femur) Semimembranosus: extends hip (femur); flexes knee Semitendinosus: extends hip (femur); flexes knee Temporalis Closes the jaw. Elevates the mandible. Biceps Femoris Anterior View Posterior View
The muscles has two different origins andone insertion resulting in a branched muscle. The long head of the muscle originates fromthe ischial tuberosity and functions to extendand laterally rotate the hip. The short head of the muscle originates onthe linea aspera of the femur. Both the long and short head insert on thehead of the fibula and lateral condyle of thetibia. Both the long and short heads function toflex the knee. Anterior View Posterior View Tibialis Anterior Dorsiflexion and inversion of the ankle. Gastrocnemius Plantarflexion of the ankle Flexes the knee Soleus Plantarflexion of the ankle. Steadies the leg when standing.