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Muscles of the neck

Cervical plexus#scalene muscles#sternocleidomastoid
329K views|4 years ago
💫 Short Summary

In this anatomy lesson, Dr. Morton covers the muscles of the neck, including the platysma, sternocleidomastoid, trapezius, scalenes, and prevertebral muscles. He also explains the innervation of these muscles and their role in the movement of the head, neck, and shoulders. The blog post further explores the intricacies of neck musculature, including their role in breathing and the functional significance of the cervical fascia.

✨ Highlights
📊 Transcript
Dr. Morton discusses the muscles of the neck, including the platysma in the superficial fascia, the sternocleidomastoid and trapezius in the deep investing fascia, and the scalene muscles in the prevertebral fascia.
00:00
The platysma muscle is located in the superficial fascia of the neck and is involved in wrinkling the skin and tensing the neck.
The innervation of the platysma muscle is via the facial nerve (cranial nerve VII).
The sternocleidomastoid muscle turns the head to the opposite side and flexes the neck on the same side.
The trapezius muscle is responsible for elevating the scapula and shrugging the shoulders.
The scalene muscles are found in the prevertebral fascia and are important for the breathing process.
The video discusses the muscles of the neck and their relation to the brachial and cervical plexuses.
03:26
The scalene muscles are named based on their position and function.
The muscles of the neck and the nerves are organized in a similar way to other parts of the body, such as the trunk.
The scalene muscles play a crucial role in the movement and support of the neck.
The infrahyoid muscles are involved in swallowing and are innervated by the cervical plexus.
The video covers the muscles of the neck, including the scalene muscles, levator scapulae, longus capitis, and longus colli.
06:27
The scalene muscles are involved in elevating the first and second ribs and lateral flexion of the neck.
The brachial plexus, which innervates the scalene muscles, is composed of branches from C4 to T1.
The levator scapulae muscle elevates the scapula and is also innervated by the brachial plexus.
The longus capitis and longus colli muscles are important for flexing and stabilizing the neck.
The muscles of the neck are discussed, including the infrahyoid muscles and their innervation by the cervical plexus.
09:13
The infrahyoid muscles, including the sternohyoid, omohyoid, and thyrohyoid muscles, help depress and support the hyoid bone.
The muscles are innervated by the ansa cervicalis, a loop of nerves within the cervical plexus.
The action of the infrahyoid muscles is not tested clinically but is important for swallowing and speech.
The video explains the presence of both somatic body wall muscles and branchial arch muscles in the neck, using an analogy of an orange on a toothpick to illustrate the need for muscle stabilization.
10:09
Somatic body wall muscles in the neck, such as the infrahyoid and scalene muscles, are involved in neck stability and breathing.
Branchial arch muscles like the sternocleidomastoid and trapezius have migrated down to the shoulder and back to help stabilize the head and neck.
The cooperation of these different groups of muscles is essential for the wide range of movements and stability in the neck.
💫 FAQs about This YouTube Video

1. What are the muscles found in the superficial fascia of the neck?

The muscles found in the superficial fascia of the neck include the platysma, which wrinkles the skin of the neck, and is innervated by the facial nerve (cranial nerve VII).

2. How are the sternocleidomastoid and trapezius muscles named?

The sternocleidomastoid is named according to its attachments, and the trapezius is named for its trapezoid shape.

3. What are the actions of the sternocleidomastoid and trapezius muscles?

The sternocleidomastoid muscle turns the head to the opposite side and flexes the neck, while the trapezius muscle elevates the scapula and shrugs the shoulders.

4. What is the function of the scalene muscles in the neck?

The scalene muscles in the neck are important for breathing, as they elevate the first and second ribs, which helps increase the volume of the lungs.

5. How are the muscles of the neck innervated?

The muscles of the neck are innervated by the cervical plexus, the brachial plexus, and the spinal accessory nerve, depending on their location and function.

6. Why are both somatic body wall muscles and branchial arch muscles found in the neck?

Somatic body wall muscles, derived from the somites, and branchial arch muscles are found in the neck to provide stability and support for the wide range of movements and functions of the head and neck.