Question

pper body muscles and you notice that you are moving your head back and forward (like you are nodding yes) and shaking it from side to side (like you are saying no) in time to the music (clasic head banging style). Because you are studying Anatomy and you are an observant student you begin to think about the joints of the vertebral column that allow these movement of your head; the structures of the vestibular system which provide your brain with sensory information about these movements; and the muscles in your lateroanterior cervical region that help control these movements.

A. What bones in the vertebral column allow the movements described above?

B. What sensory structures provide information to your brain about the movements described above (Note: think carefully about the type of movement that is occuring)

C. What muscle in the lateroanterior cervical region would play a key role in the movements described above?

Answer 1

Solu :

A) Forward and Backward movements

• When You move your head forward and backward the Atlas is at work.
• It serves as a pivot and it allows head to move forward and backward

Side to Side movements when say no :-

• The atlas and axis from the atlanto axial joint allows the side to side movements when we say "no".
• The atlantoaxial joint is a compound synovial joint.

B)

• The vestibular system (the two otolith organs called the saccule and utricle) is a sensory system that is responsible for to send the signals to brain information about motion.
• It also helps in motor functions that allows to keep the body balance,stabilize the head during body movement.

c)

• The major muscles that laterally flexes and rotates the head is the sternocleidomastoid.
• The flexor muscles are also involved in head movements.