Digastric muscle

The video discusses the digastric muscle, a suprahyoid muscle forming the mouth's floor. It has two parts: the anterior and posterior bellies, each with distinct origins and nerve supplies. The anterior belly originates from the digastric fossa and is innervated by the mylohyoid nerve, while the posterior belly originates from the mastoid notch and is innervated by the facial nerve. These muscles aid in chewing, swallowing, and speech, and are crucial for hyoid bone positioning. The digastric muscle also divides the neck's anterior triangle into smaller sections. The video promotes Kenhub as a learning resource.

Which group of muscles does the digastric muscle belong to?

• Infrahyoid muscles

• Suprahyoid muscles

• Facial muscles

• Neck muscles

What is the origin of the anterior belly of the digastric muscle?

• Styloid process

• Hyoid bone

• Digastric fossa of the mandible

• Mastoid notch of the temporal bone

Which nerve innervates the anterior belly of the digastric muscle?

• Glossopharyngeal nerve

• Mylohyoid nerve

• Hypoglossal nerve

• Facial nerve

From which pharyngeal arch does the posterior belly of the digastric muscle arise?

• Second pharyngeal arch

• First pharyngeal arch

• Third pharyngeal arch

• Fourth pharyngeal arch

What is the primary function of the posterior belly of the digastric muscle?

• Draws back the hyoid bone

• Depresses the mandible

• Pulls the mandible forward

• Elevates the larynx