Questions and Answers
What is one of the primary actions of the platysma muscle?
Which nerve is associated with the sternocleidomastoid muscle?
Which action is NOT performed by the scalenes muscle?
What is a function of the sternocleidomastoid muscle?
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Which root corresponds with the facial nerve that innervates the platysma?
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Which action is a primary function of the sternocleidomastoid muscle?
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Which nerve is primarily responsible for innervating the platysma muscle?
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What is one of the actions associated with the scalenes muscle?
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Which muscle is responsible for tightening the fascia of the neck?
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Which action is NOT performed by the platysma muscle?
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Study Notes
Anterior Muscles of the Neck: Superficial Layer
- Platysma: A thin, broad muscle located beneath the skin of the neck and lower face.
- Nerve Supply: Innervated by the facial nerve (cranial nerve VII) and the spinal accessory nerve (cranial nerve XI); also receives segmental contributions from ventral primary rami (VPR).
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Actions:
- Draws the corner of the mouth downward.
- Assists in depressing the mandible.
- Tightens the fascia of the neck, contributing to the overall stability of the neck region.
Sternocleidomastoid
- Location: Spans from the sternum and clavicle to the mastoid process of the temporal bone.
- Nerve Supply: Innervated by the spinal accessory nerve (cranial nerve XI) and receives sensory innervation from C2-C3.
-
Actions:
- Produces head extension and neck flexion.
- Facilitates ipsilateral sidebending of the head and neck.
- Allows contralateral rotation of the head and neck.
Scalenes
- Muscle Group: Comprises three muscles (anterior, middle, and posterior) located laterally in the neck.
- Nerve Supply: Innervated by ventral primary rami of cervical nerves C3-C8.
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Actions:
- Assists with neck flexion.
- Aids in sidebending of the neck.
- Facilitates contralateral rotation.
- Plays a role in elevating the first rib during respiration.
Anterior Muscles of the Neck: Superficial Layer
- Platysma: A thin, broad muscle located beneath the skin of the neck and lower face.
- Nerve Supply: Innervated by the facial nerve (cranial nerve VII) and the spinal accessory nerve (cranial nerve XI); also receives segmental contributions from ventral primary rami (VPR).
-
Actions:
- Draws the corner of the mouth downward.
- Assists in depressing the mandible.
- Tightens the fascia of the neck, contributing to the overall stability of the neck region.
Sternocleidomastoid
- Location: Spans from the sternum and clavicle to the mastoid process of the temporal bone.
- Nerve Supply: Innervated by the spinal accessory nerve (cranial nerve XI) and receives sensory innervation from C2-C3.
-
Actions:
- Produces head extension and neck flexion.
- Facilitates ipsilateral sidebending of the head and neck.
- Allows contralateral rotation of the head and neck.
Scalenes
- Muscle Group: Comprises three muscles (anterior, middle, and posterior) located laterally in the neck.
- Nerve Supply: Innervated by ventral primary rami of cervical nerves C3-C8.
-
Actions:
- Assists with neck flexion.
- Aids in sidebending of the neck.
- Facilitates contralateral rotation.
- Plays a role in elevating the first rib during respiration.
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Description
Test your knowledge on the superficial anterior muscles of the neck, including the platysma, sternocleidomastoid, and scalenes. Explore their actions, nerve innervations, and more in this comprehensive quiz on neck anatomy.
