Chapter 11 homework

Fill in the blanks with the correct muscles to complete each sentence. 1. The muscle of the pelvic floor that assists in the erection of the penis or clitoris is the ____________ . 2. The muscle of the pelvic floor that closes the anal opening and must relax to defecate is the ____________ . 3. The muscle that ejects urine or semen in males is the ____________ . 4. The muscle that constricts the urethra to voluntarily inhibit urination is the ____________ .

1. ischiocavernosus 2. external anal sphincter 3. bulbospongiosus 4. external urethral sphincter

From superficial to deep, place the muscles of the abdominal wall in the correct order.

External oblique Internal oblique Transversus abdominis

The muscle that compresses the cheek against the teeth when we chew is the

buccinator

Label the erector spinae muscle groups in the figure.

different order on the homework

The abdominal wall muscle that forms the inguinal ligament is the

external oblique

During normal, relaxed exhalation, the internal intercostals contract to assist with this process.

false

The muscle that encircles the mouth and is used to "pucker up" for a kiss is the platysma muscle.

false

Check all that are functions of the muscles of the abdominal wall.

flexion of the vertebral column compression of the abdominal wall

The ______________ muscles of the tongue curl, squeeze, and fold the tongue during chewing and speaking; the ____________ muscles of the tongue are used in various combinations to accomplish the precise, complex, and delicate movements required for proper speech.

intrinsic, extrinsic

Check all that are true about the abductor pollicis longus muscle based on its name.

it has a long shape. it is located at the thumb region. it acts to abduct a body part.

Which of the following extrinsic eye muscles is not innervated by CN III?

lateral rectus

The collection of muscles in the pelvic floor that function to support the pelvic viscera and act as a sphincter at the anorectal junction, urethra, and vagina is the

levator ani

Check all that are a bilateral action of the erector spinae muscles

maintain posture extend the vertebral column

Which muscle is the most powerful muscle of mastication and functions to elevate and protract the mandible?

masseter

Which of the following are considered muscles of mastication? Check all that apply.

masseter temporalis lateral and medial pterygoid muscles

Drag and drop the muscle names into the appropriate categories based on where in the body it is located.

mouth region: orbicularis oris wrist: flexor carpi ulnaris great toe: extensor hallucis longus toward back of body: latissimus dorsi deep to another structure: flexor digitorum profundus

The diamond-shaped region between the lower appendages is called the

perineum

Classify the muscles of the cheeks and mouth based on their functions.

pulls the mouth inferiorly: depressor labii inferioris, depressor anguli oris pulls the mouth superiorly and laterally (smiling): levator anguli, zygomaticus major and minor

The abdominal muscle that extends vertically the entire length of the anteromedial abdominal wall and forms the traditional "six pack" is the

rectus abdominis

If you contract your left sternocleidomastoid muscle only, it rotates your head to the __________ side of the body.

right

The muscle that has its superior attachment on the mastoid process and has a bilateral action of flexing the neck is the

sternocleidomastoid

The diaphragm is the most important muscle associated with respiration.

true