Which muscle closes and purses the lips, as when whistling?

A student squeezes both eyelids shut against bright light. Which facial muscle produces that closure?

Which muscle pulls the corner of the mouth upward and laterally during a broad smile?

Food is kept between the teeth while chewing because one cheek muscle presses the cheek inward. Name that muscle.

The strong superficial jaw closer over the mandibular ramus contracts when a person clenches their teeth. Which muscle is it?

Which fan-shaped muscle on the side of the skull helps elevate and retract the mandible?

Raising the eyebrows and making horizontal wrinkles across the forehead mainly uses which muscle?

Which thin superficial muscle tenses the skin of the neck and can pull the lower lip downward?

Which expression muscle pulls skin between the eyebrows downward, wrinkling the bridge of the nose?

A tight, straight grin pulls the mouth corner laterally without lifting it much. Which muscle performs that action?

Turning the head to the left while tilting it toward the right shoulder uses the right strap from collarbone area to skull. Name it.

When both right and left sternum-to-skull neck straps contract together, the neck flexes forward. Which muscle pair is working?

A shrug that raises the shoulders toward the ears mainly uses which superficial back muscle?

Pulling the shoulder blades medially to stand tall is mainly an action of which superficial back muscle?

During a pull-up, which broad lower-back muscle helps pull the upper arm down and backward toward the trunk?

Throwing a punch protracts the scapula and holds its medial border against the rib cage. Which muscle does this?

A controlled crunch brings the rib cage toward the pelvis by flexing the vertebral column. Which abdominal muscle is the prime mover?

The right side helps turn the torso left while increasing abdominal pressure. Which muscle is acting?

The left side helps turn the shoulders left while compressing the abdominal wall. Which muscle matches that same-side rotation?

Straightening up after bending forward requires extension of the vertebral column. Which posterior trunk muscle group performs it?

Which muscle runs from the sternum and clavicle to the mastoid process behind the ear?

A broad triangular sheet attaches from the skull and vertebral spines to the clavicle and scapular spine. Which muscle is described?

Which muscle is fan-shaped on the side of the skull and passes deep to the zygomatic arch to reach the mandible?

Which thick chewing muscle runs from the zygomatic arch to the angle and ramus of the mandible?

A broad anterior thoracic muscle arises from the clavicle, sternum, and upper costal cartilages and inserts on the humerus. Name it.

Which broad muscle starts on the lower spine and iliac crest, then inserts on the proximal humerus to form the posterior axillary fold?

Which paired vertical strap runs from the pubis to the xiphoid process and costal cartilages?

Saw-toothed slips along the upper ribs insert on the medial border of the scapula. Which muscle has this attachment pattern?

A thin superficial sheet extends from fascia over the upper chest to the mandible. Which muscle is this?

What does the frontalis do when it contracts?

What is the main action of the masseter?

What does pectoralis major do at the shoulder joint?

What action is produced by latissimus dorsi?

What does rectus abdominis do when it contracts?

When one external oblique contracts, what trunk action does it help produce?

What happens when one sternocleidomastoid contracts by itself?

The name sternocleidomastoid is built from three attachments. Which structures do those parts identify?

In the name orbicularis oculi, what do the word parts describe?

What does the name rectus abdominis indicate about the muscle?

What do the words external oblique tell you about that abdominal muscle?