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