Neck muscles (with actions and labels)
Summary
TLDRThis 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.
Outlines
💪 Muscles of the Neck: Flexion and Extension
This paragraph introduces the topic of the video, focusing on the muscles responsible for neck flexion and extension. It highlights the sternocleidomastoid muscle, which is attached to the sternum, clavicle, and mastoid process, and its role in neck movement. Additionally, it mentions the anterior, middle, and posterior scalene muscles, which assist in flexing the neck and can also perform lateral flexion when contracted unilaterally. The paragraph also touches on muscles like the levator scapulae, which elevates the scapula, and the splenius capitus, which, along with the semi-spinalis capitus and the superior portion of the trapezius, are involved in neck extension.
Mindmap
Keywords
💡Neck Flexion
💡Sternocleidomastoid
💡Scalene Muscles
💡Lateral Flexion
💡Levator Scapulae
💡Splenius Capitus
💡Semi-Spinalis Capitus
💡Trapezius Muscle
💡Omohyoid Muscle
💡Sternohyoid
💡Hydro Muscles
Highlights
Introduction to the muscles involved in neck movement, focusing on flexion and extension.
Explanation of neck flexion and the muscles responsible for it, located at the front of the neck.
Identification of the sternocleidomastoid muscle and its attachment points.
Description of the anterior, middle, and posterior scalene muscles and their role in neck flexion.
Unilateral flexion of the neck muscles and its effect on lateral flexion.
Introduction of the levator scapulae muscle and its function in elevating the scapula.
Mention of the splenius capitus muscle and its position relative to other neck muscles.
Role of the semi-spinalis capitus muscle in neck extension.
Function of the superior portion of the trapezius muscle in maintaining an upright head position.
Brief mention of muscles beneath the sternocleidomastoid for a comprehensive understanding.
Identification of the superior belly of the omohyoid muscle and its anatomical landmarks.
Introduction of the sternohyoid muscle and its attachment to the sternum.
Reference to a dedicated video on hyoid muscles for further learning.
Clarification on muscles that do not move the neck but are located in the neck area.
Emphasis on the importance of understanding muscle function for proper neck movement and health.
Summary of the video's educational content on neck muscles and their functions.
Transcripts
hello everyone
so in this video i'm going to be talking
about the muscles which move your neck
primarily i'm going to be talking about
neck flexion and
extension but i will also mention a
couple muscles
that are on your neck which aren't
actually moving your neck
so starting with neck flexion the
muscles doing neck flexion are going to
be on the front of your neck
because they're pulling your head
forward down to your chest
so this large muscle here is the
sternocleidomastoid
it's called that because it's attached
to your sternum
clavicle and mastoid process
if we look on the deep side of the model
we can see under the sternocleidomastoid
you have three muscles
the anterior scalene
middle scalene and posterior scalene
so all of these muscles will flex
your neck so bend your head forward like
you're putting your chin to your chest
however if you are flexing them
unilaterally so only one side at a time
then you will laterally flex your neck
which is bend your head down like you're
touching your ear to your shoulder
from the posterior scalene if you keep
working your way back
now you're at the levator scapulae
like you can guess from its name the
levator scapulae is
not going to move the neck the levator
scapulae
actually elevates the scapula
so when you shrug your shoulders you're
using
your levator scapulae
next to the levator scapulae
is the splenius capitus
and the splenius capitus is sitting over
top
of the semi-spinalis
capitus
and then sitting over top both of those
muscles
is the superior portion of the trapezius
remember the trapezius is a giant muscle
so we're only seeing
part of it here but this part of the
trapezius
the semi-spinalis capitus
and the splenius capitus are all
extending your neck so they help keep
your head
in an upright position
and also they help
pull your head backwards towards your
back
real quick i'm gonna go back and mention
some muscles i
skipped underneath the
sternocleidomastoid
just to help you keep things in
perspective
this muscle here is the superior
belly of the omohyoid omo means shoulder
so you find the inferior belly of the
omohyoid
pointing towards the shoulder right here
and next to the superior belly of the
omohyoid
is the sternohyoid
because it's going to attach to your
sternum
if you want to learn more about the
hyoid muscles i have an entire video
dedicated just to them that i will link
in the description
you
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