Neck muscles (with actions and labels)

Summary

This video delves into the muscles responsible for neck movement, focusing on flexion and extension. The sternocleidomastoid muscle, along with the anterior, middle, and posterior scalene muscles, facilitate neck flexion, enabling the head to tilt forward. Unilateral flexion allows for lateral neck bending. Muscles like the levator scapulae, splenius capitus, semi-spinalis capitus, and superior trapezius support neck extension, maintaining an upright head position and aiding in backward head movement. The video also briefly touches on muscles like the omohyoid and sternohyoid, with a dedicated video for hyoid muscles available.

Takeaways

• 📚 The video discusses the muscles responsible for neck movements, focusing on flexion and extension.
• 💪 The sternocleidomastoid muscle, attached to the sternum, clavicle, and mastoid process, is a key muscle in neck flexion.
• 🔍 Deeper muscles like the anterior, middle, and posterior scalene muscles assist in neck flexion.
• 👂 Flexing the scalene muscles unilaterally can result in lateral neck flexion, allowing you to touch your ear to your shoulder.
• 🚫 The levator scapulae muscle does not move the neck but instead elevates the scapula, as used in shrugging.
• 🔑 The splenius capitus and semi-spinalis capitus muscles, along with the upper part of the trapezius, are involved in neck extension.
• 📈 These muscles help maintain an upright head position and assist in pulling the head backward.
• 🔄 The superior belly of the omohyoid muscle is mentioned, which points towards the shoulder, and the sternohyoid muscle attaches to the sternum.
• 🔗 There is a dedicated video about hyoid muscles which will be linked in the description for further learning.
• 🧠 The script emphasizes understanding the different muscles' roles in neck movement for better knowledge of anatomy.
• 🔍 Additional muscles beneath the sternocleidomastoid are mentioned to provide a comprehensive view of the neck's muscular structure.

Q & A

What is the primary focus of the video?

The video primarily discusses the muscles responsible for neck flexion and extension, along with mentioning some muscles on the neck that do not move the neck.

Which muscle is responsible for neck flexion and where is it located?

The sternocleidomastoid muscle is responsible for neck flexion, and it is located on the front of the neck.

What are the three muscles located deep to the sternocleidomastoid that assist in neck flexion?

The three muscles located deep to the sternocleidomastoid that assist in neck flexion are the anterior scalene, middle scalene, and posterior scalene.

What happens when you flex the scalene muscles unilaterally?

When flexing the scalene muscles unilaterally, you laterally flex your neck, which involves bending your head towards your shoulder as if touching your ear to it.

What is the function of the levator scapulae muscle?

The levator scapulae muscle is responsible for elevating the scapula, which is used when you shrug your shoulders.

Which muscles are involved in neck extension and help maintain an upright head position?

The splenius capitus, semi-spinalis capitus, and the superior portion of the trapezius muscles are involved in neck extension and help maintain an upright head position.

What muscle is mentioned that is not involved in moving the neck but is located in the neck area?

The levator scapulae muscle is mentioned as not being involved in moving the neck but is located in the neck area.

What is the omohyoid muscle and what does it signify?

The omohyoid muscle has a superior and inferior belly, with 'omo' meaning shoulder, indicating its function or location in relation to the shoulder.

What is the function of the sternohyoid muscle?

The sternohyoid muscle is involved in neck flexion, as it attaches to the sternum and assists in bending the head forward.

Is there additional information about hyoid muscles available in other videos?

Yes, there is a dedicated video about hyoid muscles that will be linked in the description for those who want to learn more.

What is the significance of the sternocleidomastoid muscle's name?

The name 'sternocleidomastoid' signifies its attachment points: the sternum, clavicle, and mastoid process, which helps in identifying its location and function.