Omohyoid Muscle: Anatomy, Function, And Clinical Relevance

Omohyoid Muscle: Anatomy, Function, And Clinical Relevance

Question 1. Inferior constrictor
Answer:

Inferior constrictor Parts:

• Thyropharyngeus
• Cricopharyngeus

Inferior constrictor Origin:

Inferior constrictor Insertion:

• Median raphe of posterior wall of pharynx

Inferior constrictor Nerve supply:

• Accessory nerve
• External and recurrent laryngeal nerve

Inferior constrictor Actions:

• Contracts reflexly during deglutition and induce a wave of peristalsis
• Thyropharyngeus causes propulsion
• Cricopharyngeus acts as sphincter

Question 2. Omohyoid muscle
Answer:

• Omohyoid is infrahyoid muscle

Omohyoid muscle Parts:

• Superior belly – insertion of muscle is by it
• Inferior belly origin of muscle is by it
• Common tendon

Omohyoid muscle Origin:

• Upper border of scapula
• Adjoining part of suprascapular ligament

Omohyoid muscle Insertion:

• Lower border of body of hyoid bone

Omohyoid muscle Action:

• Depresses hyoid bone following its elevation