The correct answer is the direction of fascicles. Each term refers to a different direction of the fibers of a muscle or the muscle as a whole:

• rectus = straight
• transverse = across
• oblique = diagonally
• orbicularis = circular

For example, the rectus abdominis muscles run straight across the abdomen/midline and go through the belly-button. These straight fibers and muscles, when lean and well-toned, create the "six-pack."

The other answer choices are all involved in naming of muscles, but their groups do not contain the terms rectus, transverse, oblique and orbicularis.

• size = vastus (biggest), maximus (large), minimus (small), longus (long), brevis (short)

The following are examples of how to use other characteristics to name muscles:

• location = pectoralis (chest), gluteus (buttocks), brachii (arm), supra- (above), infra- (below), sub- (under/ beneath), lateralis (lateral)
• shape = deltoid (triangular), rhomboid (like a rhombus), latissimus (wide), teres (round), trapezius (like a trapezoid)
• origin and insertion = sternocleidomastoideus (origin on the sternum and clavicle, insertion on the mastoid process), brachioradialis (origin on the brachium or arm, insertion on the radius)

By definition, a foramen is any hole through a bone through which muscles, nerves, and blood vessels can pass and connect body parts together. A tubercle is a rounded projection on a bone. A condyle is a rounded projection on the end of a bone. A fossa is a a depression in a bone, and is often a site of articulation. A sinus is a cavity within a bone or other tissue.

Osseous tissue, also known as bone tissue, is a type of connective tissue.

The spinal cord passes through a large hole in the base of the skull called the foramen magnum. Foramen are holes that vessels or nerves pass through. Nerves and veins can line grooves as well, but grooves are not enclosed. Fossa are small depressions in bones. Tubercles are raised projections on bones such as the tibial tuberosity that can be felt on the anterior portion of the leg just inferior to the knee.

Plantar flexion is the movement where the angle between the sole of the foot and the back of the leg decreases. Plantar flexors are part of the posterior compartment of the lower leg, and consist of flexor hallucis longus and flexor digitorum. These muscles not only work in plantar flexion but also flex the phalanges of the foot (toes).

Abduction is a movement where structures increase their distance to the midline.

Dorsiflexion is a movement where the toes are brought closer to the shin.

Eversion is the movement of the sole of the foot away from the median plane; inversion is the movement of the sole towards the median plane.

Simple cuboidal cells can be found on the surface of ovaries, simple columnar epithelium can be found lining many digestive tract organs, pseudostratified columnar are found in the trachea and aid with secretion and absorption, and stratified cuboidal protect ducts of various glands.

The clavicle is another term for the collar bone. In contrast, the term "brachial" refers to the arm, specifically the upper arm. The term "digital" refers to the fingers and toes, or the digits of the extremities. Lastly, the term "cervical" refers to the neck (either the neck region on our bodies, or the neck of organs, such as the female uterus).

The kneecap area is known as the patellar region. The cural region is the lower leg (below the knee.) The carpal region is the wrist and the lumbar region is the lower back.

The cubital region is the area around the elbows. The kneecaps are in know as the patellar region. The thighs are in the femoral region. The armpit are in the axillary region.

Only plantar and hallux are correct which correspond to the bottom of the foot and the big toe respectively. The rest of terms are in widely different regions of the body. Palmar and hallux refers to the palms and the big toes. Inguinal and buccal refers to the groin and the area of the cheeks on the face. The pollux and olecranon refers to the thumb and the back of the elbow.