Although it is not its primary function, when used as an accessory muscle of ventilation, the serratus anterior helps expand the thorax posteriorly. When used as accessory muscles, the pectoralis major and minor expand the thorax anteriorly. The external intercostals are not accessory muscles of ventilation, and they expand the thorax anteriorly and laterally. The internal intercostals are not accessory muscles either, and the function during expiration, which decreases the dimensions of the thorax.

There are five muscles in the anterolateral group of abdominal muscles (three flat muscles and two vertical muscles). The three flat muscles include the internal and external oblique and the transversus abdominis. The two vertical muscles include the rectus abdominis and pyramidalis muscles.

The anterior scalene attaches to the transverse processes of the cervical vertebrae and the first rib. The subclavius attaches to the first rib and the clavicle. Like the anterior scalene, the middle scalene attaches to the transverse processes of the cervical vertebrae and the first rib. Although the longus colli has attachments on the thoracic spine, it does not attach to the ribcage.

The trapezius muscle is one of the superficial, upper back that originates in the spinous processes of C1-C7. Of the possible nerves, only the accessory nerve innervates muscles in the upper, superficial back. The trapezius is one of two muscles that is innervated by the accessory nerve, the other being the sternocleidomastoid.

The superior oblique muscle in the upper/middle part of the eye. That means that when this muscle contracts, the eye will be pulled towards the center of the face. In anatomical position, this action is described as a medial, or towards the midline, rotation.

The superior oblique produces depression and intorsion of the eye. The inferior oblique produces elevation and extorsion of the eye. The lateral rectus produces abduction of the eye. The internal oblique is a trunk muscle that has no attachment to the eye, and produces (among other movements) trunk ipsilateral rotation.

In order for a muscle to depress and lower the thyroid cartilage, it needs to originate below and insert either at or above the thyroid cartilage. The correct answer is the sternothyroid. This muscle originates at the sternum and inserts at the thyroid cartilage. When this muscle contracts, the action causes the thyroid/larynx to lower and depress.

For this question, we are looking for a muscle that is located around the eye and thus responsible for its movement. The correct answer is the orbicularis oculi which is the only muscle of the answer choices that fits. Although each of these muscles is located in the face, none of the other choices are around the eye.

The muscles that help in forced breathing are located in the deep compartment of the back, leaving only the serratus posterior superior and inferior muscles. The serratus posterior superior originates from C7-T3 and inserts into the superior borders of ribs 2-5, meaning it elevates the ribs while breathing. For this reason, it is the correct answer.

The oculomotor nerve is one of the cranial nerves. It runs from the brain to the orbital socket of the eye. Only two muscles in the orbital socket are not innervated by the oculomotor nerve: the superior oblique and the lateral rectus muscles. The lateral rectus is innervated by the abducens nerve (cranial nerve XI), and the superior oblique is innervated by the trochlear nerve (cranial nerve IV).