Neck Anterior Posterior Triangle

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Which structure is primarily responsible for elevating the hyoid and the floor of the mouth?

Geniohyoid muscle

Mandibular branch of trigeminal nerve (CN V3) (correct)

Sternothyroid muscle

Ansa cervicalis

Which cranial nerve is associated with the innervation of the geniohyoid muscle?

CN X

CN XII

C1 via CN XII (correct)

CN V

What is the primary function of the sternohyoid muscle?

Elevates the hyoid bone

Supports the floor of the mouth

Elevates the mandible

Depresses the hyoid bone (correct)

Which of the following is NOT a branch of the external carotid artery?

Internal carotid artery Signup and view all the answers

Which of the following nerves is part of the ansa cervicalis?

C1 and C2 spinal nerves Signup and view all the answers

Which nerve is NOT typically associated with the carotid sheath?

Phrenic nerve Signup and view all the answers

Which cervical nerve primarily innervates the thyrohyoid muscle?

C1 Signup and view all the answers

Which of the following statements about the anterior triangle borders is incorrect?

The superior border is formed by the inferior border of the clavicle. Signup and view all the answers

What is the primary action of the sternocleidomastoid muscle when both heads contract bilaterally?

Flex the neck Signup and view all the answers

Which muscles are classified under the strap (infrahyoid) muscles?

Sternohyoid and sternothyroid Signup and view all the answers

Which muscle is primarily responsible for elevating the first rib during inspiration?

Anterior scalene Signup and view all the answers

What structures are found in the digastric triangle?

Submandibular gland and facial artery Signup and view all the answers

What is the source of innervation for the infrahyoid muscles?

Ansa cervicalis Signup and view all the answers

Which of the following is NOT supplied by the cervical plexus?

Trapezius muscle Signup and view all the answers

Which artery is found in the posterior triangle?

Transverse cervical artery Signup and view all the answers

Which muscle originates from the posterior tubercles of the transverse processes of CV1-4?

Levator scapulae Signup and view all the answers

Which cervical nerve root contributes to sensory innervation of the sternocleidomastoid muscle?

C2 Signup and view all the answers

What is the main function of the ansa cervicalis?

To innervate cervical muscles Signup and view all the answers

What action does the mylohyoid muscle contribute to during swallowing?

All of the above Signup and view all the answers

Which of the following is a superficial branch of the cervical plexus?

Transverse cervical nerve Signup and view all the answers

What is the main action of the scaleni muscles?

Ipsilateral sidebending of cervical vertebrae Signup and view all the answers

What structure is surrounded by the pretracheal fascia in the neck?

Thyroid gland Signup and view all the answers

Which of the following muscles is NOT covered by the investing layer of fascia?

Scalene muscles Signup and view all the answers

Identify the muscle that helps form the floor of the posterior triangle of the neck.

Levator scapulae Signup and view all the answers

Which fascia layer acts as a roof to the anterior triangle of the neck?

Investing fascia Signup and view all the answers

Which structure is NOT part of the cervical plexus?

Inferior thyroid artery Signup and view all the answers

Which general function do the strap muscles perform?

Stabilize and depress the hyoid bone Signup and view all the answers

What is the primary role of the carotid sheath in the neck?

Surround the carotid arteries and jugular veins Signup and view all the answers

Which structure is located deep to the trachea?

Esophagus Signup and view all the answers