Muscles of Thorax

The anterior, middle, and posterior scalene muscles are the oblique muscles of the neck, which ________. A) elevate the first two ribs and/or flex the neck B) elevate the first two ribs and enlarge the thoracic cavity C) depress the first two ribs and flex the neck D) depress the first two ribs and flex the vertebral column E) elevate the first two ribs and oppose the diaphragm

A) elevate the first two ribs and/or flex the neck

Acting bilaterally, the splenius capitis __________. A) extends the head B) medially flexes the head C) laterally flexes the head D) rotates the head

A) extends the head

Which of the following muscles plays NO role in respiration? A) iliocostalis thoracis B) internal intercostals C) diaphragm D) external intercostals

A) iliocostalis thoracis

Which of the following muscles does NOT elevate the ribs? A) internal intercostals B) superior serratus posterior C) external intercostals D) scalenes

A) internal intercostals

Paralysis of the phrenic nerve would affect which of the following? A) respiration B) maintaining an erection C) eating D) eye movements

A) respiration

The entire length of longissimus muscle extends from the mastoid process of the temporal bone to the __________. A) sacrum B) thoracic vertebrae seven C) lumbar vertebrae five D) linea aspera of the femur

A) sacrum

The erector spinae muscle group that is located most medial to the vertebral column is the ________. A) spinalis group B) iliocostalis group C) capitis group D) longissimus group E) thoracis group

A) spinalis group

What is the origin of the serratus posterior inferior?

Aponeurosis from spinous processes of T11-L2/3

What is the action of the serratus posterior?

Assist in moving ribs during respiration

What would be the result if the longus capitis and longus colli were paralyzed? A) It would be harder to extend the vertebral column. B) It would be more difficult to turn the head to the left or right to examine a visual stimulus. C) It would be more difficult to breathe. D) It would be impossible to hold the head uprigh

B) It would be more difficult to turn the head to the left or right to examine a visual stimulus.

The insertions of the semispinatus capitus are on the __________. A) zygomatic processes of the temporal bone B) occipital bone C) spinous process of the cervical vertebrae D) tendon of the galea aponeuresis

B) occipital bone

The diaphragm muscle is innervated by ________. A) cranial nerve X B) the phrenic nerves C) the subcostal nerves D) the thoracic nerves E) the intercostal nerves

B) the phrenic nerves

The deepest lateral layer of the abdominal muscles is the ________. A) psoas major B) transverse abdominis C) rectus abdominis D) external oblique E) internal oblique

B) transverse abdominis

These posterior neck muscles extend, rotate, and laterally flex the cervical vertebrae. A) Longissimus group B) Spinalis group C) Splenius group D) Iliocostalis group E) None of the answers are correct.

C) Splenius group

Which of the following is the function of the superficial layer of the intrinsic back muscles? A) depress the ribs B) flexion of the vertebral column C) extension or lateral flexion of the neck D) hyperextension of the vertebral column E) interconnect and stabilize the vertebrae

C) extension or lateral flexion of the neck

Which of the following extends the vertebral column and depresses the ribs? A) longus capitis B) longus colli C) iliocostalis lumborum D) quadratus lumborum E) longus cervicis

C) iliocostalis lumborum

The transversus abdominus muscle is innervated by the __________. A) thoracic nerve B) inguinal nerve C) intercostals nerves D) left scapular nerve

C) intercostals nerves

Which of the following can flex the neck? A) longissimus thoracis B) multifidus C) longus colli D) iliocostalis lumborum E) iliocostalis cervicis

C) longus colli

The fibers of the iliocostalis muscle are divided into which three regions? A) lumbar, abdominal, and cervical B) umbilical, thoracic, and cervical C) lumbar, thoracic, and cervical D) abdominal, axillary, and cervical

C) lumbar, thoracic, and cervical

The origins of the rectus abdominus muscle are on the __________. A) ileum bone B) sacral bone C) pubic bone D) ischial bone

C) pubic bone

The ________ muscle is divided longitudinally by a median collagenous partition called the linea alba. A) transverse abdominis B) internal oblique C) rectus abdominis D) diaphragm E) external oblique

C) rectus abdominis

The intermediate layer of the intrinsic back muscles is also called the ________ group. A) interspinalis B) intertransversarii C) spinal flexor D) erector spinae E) rotatores

D) erector spinae

Of the following muscles, which can compress the abdomen? A) rectus abdominis B) transversus abdominis C) internal oblique D) external oblique E) All of the answers are correct.

E) All of the answers are correct.

The oblique muscle and/or rectus muscle do which of the following? A) occur in the neck B) important role in respiratory movements of the ribs C) rotate the vertebral column D) compress underlying structures E) All of the answers are correct.

E) All of the answers are correct.

The muscular partition that separates the abdominopelvic and thoracic cavities is the ________. A) perineum B) rectus abdominis C) masseter D) transversus abdominis E) diaphragm

E) diaphragm

Flexion of the vertebral column and depression of the ribs are actions accomplished by the ________ muscles in the abdominal wall. A) internal intercostals B) diaphragm C) transversus abdominis D) inferior serratus posterior E) rectus abdominis

E) rectus abdominis

What is the insertion of the serratus posterior inferior?

Inferior borders of ribs 9-12

What is the origin of the serratus posterior superior?

Spinous processes of C7-T3

What is the insertion of the serratus posterior superior?

Superior borders of ribs 2-5

True or False: The internal intercostal muscles aid in respiration by depressing the ribs.

True