-Achondroplasia

question 18

Multiple Choice

-Achondroplasia

• A) is inherited as an autosomal recessive condition.
• B) affects about one in one million people.
• C) affects only homozygotes.
• D) is characterized by abnormally short arms and legs.
• E) is all of these.

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Definitions:

Semispinalis Thoracis

A muscle in the back that extends from the thoracic vertebrae to the base of the skull, helping in the extension and rotation of the spine.

Multifidus

A muscle located in the spine that stabilizes the vertebrae and assists with spinal movements.

Quadratus Lumborum

A deep muscle in the lower back that helps with the stabilization of the pelvis and the spine, as well as aiding in lateral movement of the torso.

Serratus Posterior

A muscle group consisting of the serratus posterior superior and inferior, which aid in the movements of the rib cage.