Head
What is the primary action of the masseter muscle, and where does it insert?
Closes jaw, important for chewing.
Insertion: angle and lateral surface of ramus of mandible.
Which muscle is primarily responsible for flexion of the forearm at the elbow joint and also contributes to supination of the forearm?
The biceps brachii
Which muscle is primarily responsible for elevating the scapula and extending the neck?
The trapezius muscle.
What is the main action of the quadriceps femoris muscle group?
extends the knee and helps flex the hip.
What is the primary action of the rectus abdominis muscle?
flexes the vertebral column and compresses the abdominal contents
Which head muscle is responsible for closing the eyelids, and what is its origin?
The orbicularis oculi.
the origin is the medial orbital margin and medial palpebral ligament.
What is the insertion of the triceps brachii muscle?
olecranon process of the ulna
What is the origin and insertion of the latissimus dorsi muscle?
Origin: spinous processes of T7-T12, thoracolumbar fascia, iliac crest, and lower 3–4 ribs.
insertion: Floor of the intertubercular sulcus of the humerus.
What is the primary action of the hamstring muscle group?
Flex the knee and extend hip
Where does the external oblique muscle originate and insert?
originates from the outer surfaces of ribs 5–12 and inserts into the linea alba, pubic tubercle, and anterior half of the iliac crest.
What is the origin and insertion of the temporalis muscle?
Temporal fossa And coronoid process of the mandible.
Which arm muscle originates from the coracoid process of the scapula and helps in flexion and adduction of the arm at the shoulder?
The coracobrachialis muscle.
What is the main action of the rhomboid major muscle?
Adducts the scapula.
What are the parts of the adductor muscle group in the medial thigh?
adductor longus, adductor brevis, adductor magnus, pectineus, and gracilis.
Which abdominal muscle is responsible for rotation of the trunk to the opposite side?
The external oblique muscle
Which muscle elevates the upper lip and originates from the infraorbital margin of the maxilla?
The levator labii superioris.
What is the main action of the brachialis muscle, and where does it insert?
Powerful flexor of the forearm at elbow joint. Inserts at coronoid process and tuberosity of ulna.
Which muscle originates on the transverse processes of cervical vertebrae and inserts on the superior angle of the scapula?
The levator scapulae.
What is the insertion of the tibialis anterior muscle?
Medial cuneiform and base of first metatarsal bone.
What is the deepest layer of the abdominal wall muscles and its main action?
The transversus abdominis; compress the abdominal contents, providing core stability and assisting in forced expiration.
Which muscle is responsible for wrinkling the forehead and raising the eyebrows, and what is its insertion point?
Frontalis. Insertion point: skin of forehead and eyebrows.
Which muscle in the arm is most involved in extension of the elbow and is also used in pushing movements?
The triceps branchii muscle
What action is performed by the erector spinae muscle group?
extends and laterally flexes the vertebral column
What is the main action of the gluteus maximus muscle?
Extends and laterally rotates the hip joint
What is the insertion point of the internal oblique muscle?
inserts into the inferior borders of ribs 10–12, the linea alba, and the pubis via the conjoint tendon.