This document describes the various muscles of the neck region, dividing them into anterior, posterior and lateral groups. It provides details on the location, origin, insertion, nerve supply and action of each muscle, including the longus capitis, rectus capitis anterior, rectus capitis lateralis, sternocleidomastoid, scalene muscles, platysma, longissimus capitis, oblique capitis superior, rectus capitis posterior, semispinalis capitis, splenius capitis and trapezius.
Understanding your spine and how it works can help you better understand some of the problems that occur from aging or injury.
Many demands are placed on your spine. It holds up your head, shoulders, and upper body. It gives you support to stand up straight, and gives you flexibility to bend and twist. It also protects your spinal cord.
Chapter 12 Muscular systemMuscles of Head and neck1. Scalene.docxbartholomeocoombs
Chapter 12 Muscular system
Muscles of Head and neck
1. Scalene muscles
The scalene muscles are a group of three pairs of muscles in the lateral neck:
scalenus anterior, scalenus medius, and scalenus posterior
The scalene muscles are related to the thoracic outlet syndrome
i. Scalene anterior:
Origin: transverse processes of C3 – C6
Insertion: scalene tubercle of 1st rib
Nerve supply: anterior rami of C6 – C8
Action: raises the first rib and bends neck to one side
ii. Scalene Medius
Origin: transverse processes of C1 – C6
Insertion: upper surface of 1st and 2nd ribs
Nerve supply: anterior rami of C3 – C8
Action: raises the first rib and bends neck to one side
iii. Scalene Posterior
Origin: transverse processes of C5 – C7
Insertion: upper surface of 2nd rib
Nerve supply: anterior rami of C7 – C8
Action: raises the second rib and bends neck to one side
2. Sternocleidomastoid/ Sternomastoid
It is given the name sternocleidomastoid because it originates from the sternum (sterno) and clavicle (cleido), and inserts into the mastoid process of the temporal bone of the skull. It is also called the sternomastoid muscle.
Origin: manubrium sterni + medial portion of the clavicle
Insertion: mastoid process of the temporal bone and superior nuchal line
Nerve Supply:
motor: accessory nerve
sensory: cervical plexus
Action:
Acting alone it tilts head to its own side and rotates it so the face is turned towards the opposite side.
Acting together, flexes the neck, raises the sternum and assists in forced inspiration.
3. Infrahyoid or “strap” muscles
Strap-like muscles occupy each side of the midline of the neck from the mandible to the manubrium sterni.
Between these 2 points lie the hyoid bone, and below it is the Adam’s apple or thyroid cartilage; to them certain muscles gain attachment.
They include:
Sternohyoid m., Sternothyroid m., Thyro-hyoid m. and Omohyoid muscles.
These four muscles, also known as the "strap" muscles, function to depress the hyoid bone and larynx during swallowing and speaking (except for Thyrohyoid).
i. Sternohyoid
Origin: Posterior surface of manubrium sterni, adjoining parts of clavicle and the posterior sternoclavicular ligament
Insertion: Medial part of lower border of hyoid bone
Nerve supply: Ansa cervicalis
Action: Depresses/ stabilizes hyoid bone
ii. Sternothyroid
Origin: Posterior surface of manubrium sterni and adjoining part of first costal cartilage
Insertion: Oblique line of thyroid cartilage
Nerve supply: Ansa cervicalis
Action: Depresses/ stabilizes thyroid cartilage
iii. Thyrohyoid
Origin: Oblique line of the thyroid cartilage
Insertion: Lower border of the body and the greater cornu of the hyoid bone
Nerve supply: Cervical spinal nerve 1 via the hypoglossal nerve
Action: Elevates larynx + Depresses/ stabilizes hyoid bone
iv. Omohyoid (superior belly)
Origin: Intermediate tendon
Insertion: Hyoid bone
Nerve supply: Ansa cervicalis
Action: Depresses/ stabilizes hyoid bone
v. Omohyoid (inferior belly)
Origin: .
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Chapter 12 Muscular system
Muscles of Head and neck
1. Scalene muscles
The scalene muscles are a group of three pairs of muscles in the lateral neck:
scalenus anterior, scalenus medius, and scalenus posterior
The scalene muscles are related to the thoracic outlet syndrome
i. Scalene anterior:
Origin: transverse processes of C3 – C6
Insertion: scalene tubercle of 1st rib
Nerve supply: anterior rami of C6 – C8
Action: raises the first rib and bends neck to one side
ii. Scalene Medius
Origin: transverse processes of C1 – C6
Insertion: upper surface of 1st and 2nd ribs
Nerve supply: anterior rami of C3 – C8
Action: raises the first rib and bends neck to one side
iii. Scalene Posterior
Origin: transverse processes of C5 – C7
Insertion: upper surface of 2nd rib
Nerve supply: anterior rami of C7 – C8
Action: raises the second rib and bends neck to one side
2. Sternocleidomastoid/ Sternomastoid
It is given the name sternocleidomastoid because it originates from the sternum (sterno) and clavicle (cleido), and inserts into the mastoid process of the temporal bone of the skull. It is also called the sternomastoid muscle.
Origin: manubrium sterni + medial portion of the clavicle
Insertion: mastoid process of the temporal bone and superior nuchal line
Nerve Supply:
motor: accessory nerve
sensory: cervical plexus
Action:
Acting alone it tilts head to its own side and rotates it so the face is turned towards the opposite side.
Acting together, flexes the neck, raises the sternum and assists in forced inspiration.
3. Infrahyoid or “strap” muscles
Strap-like muscles occupy each side of the midline of the neck from the mandible to the manubrium sterni.
Between these 2 points lie the hyoid bone, and below it is the Adam’s apple or thyroid cartilage; to them certain muscles gain attachment.
They include:
Sternohyoid m., Sternothyroid m., Thyro-hyoid m. and Omohyoid muscles.
These four muscles, also known as the "strap" muscles, function to depress the hyoid bone and larynx during swallowing and speaking (except for Thyrohyoid).
i. Sternohyoid
Origin: Posterior surface of manubrium sterni, adjoining parts of clavicle and the posterior sternoclavicular ligament
Insertion: Medial part of lower border of hyoid bone
Nerve supply: Ansa cervicalis
Action: Depresses/ stabilizes hyoid bone
ii. Sternothyroid
Origin: Posterior surface of manubrium sterni and adjoining part of first costal cartilage
Insertion: Oblique line of thyroid cartilage
Nerve supply: Ansa cervicalis
Action: Depresses/ stabilizes thyroid cartilage
iii. Thyrohyoid
Origin: Oblique line of the thyroid cartilage
Insertion: Lower border of the body and the greater cornu of the hyoid bone
Nerve supply: Cervical spinal nerve 1 via the hypoglossal nerve
Action.
A person suffering from pain in teres major or teres minor pain can feel symptoms of pain at the back of the upper arm when they stretch their arm forward to reach up something. Teres major and minor pain or injuries can be treated with various types of exercise, gels, therapy wraps, and workouts.
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"giving out," or as a popping sensation with knee movement. Unfortunately, there is no "key" or secret trick to unlock your knee joint, though various treatments exist to help with knee locking symptoms.
NCS are done by placing electrodes on the skin and stimulating the nerves through electrical impulses. To study motor nerves, electrodes are placed over a muscle that receives its innervation from the nerve you want to test (stimulate).
The Anterior Chest Wall Release was originally called the Thoracic Inlet Release, which is semantically misleading and anatomically incorrect. The fascia throughout the anterior and posterior chest wall is the only known physical structure that can be affected during this release.
Tender points are areas of the body that experience different types of pain when pressure is applied to them.
A Trigger Point (TrP) is a hyperirritable spot, a palpable nodule in the taut bands of the skeletal muscles' fascia.
This review summarizes the structure of ligaments and tendons, the roles of their constituent components for load transfer across the hierarchy of structure, and the current understanding of how damage occurs in these tissues.
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PET CT beginners Guide covers some of the underrepresented topics in PET CTMiadAlsulami
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6. Location:
Anterior to anterior Surface of Vertebral Column.
It is Deep Prevertebral muscle of neck.
Origin:
Transverse processes of vertebrae C3-C6.
Insertion:
Basilar part of occipital bone.
Nerve Supply:
Ventral primary rami of spinal nerves C1-C3.
Action:
Flexes the head.
7. Location:
Deep to the longus capitis .
It is Deep Prevertebral muscle of neck.
Origin:
Lateral mass and transverse process of the atlas.
Insertion:
Basilar part of occipital bone.
Nerve Supply:
Ventral primary rami of spinal nerves C1-C2.
Action:
Flexes the head.
8.
9. Location:
Just lateral to rectus capitis anterior .
It is Deep Prevertebral muscle of neck.
Origin:
Transverse process of atlas.
Insertion:
Jugular process of occipital bone.
Nerve Supply:
Ventral primary rami of spinal nerves C1-C2.
Action:
Blends head to one side.
10. Location:
Bisects the lateral aspect of the neck.
Origin:
Lateral head: medial one third of clavicle;
Medial head: manubrium sterni.
Insertion:
Mastoid process of temporal bone and
lateral half of superior nuchal line.
Nerve Supply:
Accessory nerve and C2, C3 (proprioception)
Action:
Unilaterally: approximates ear of the same side to shoulder.
Bilaterally: Flexes the head.
In unison with its counterpart: tips head back, raising the chin
11. Location:
Just deep to the clavicular head of the sternocleidomastoid
Origin:
Transverse processes of vertebrae C3–C6 .
Insertion:
Ridge and the scalene tubercle of the first rib.
Nerve Supply:
Ventral primary rami of spinal nerves C4-C6.
Action:
Function in respiration by lifting the thoracic cage.
If thoracic cage is fixed, they flex cervical vertebral column to
one side or bend it anteriorly when acting in concert
12. Location:
Lateral to the anterior scalene.
Origin:
Transverse processes of vertebrae C2–C7 .
Insertion:
First rib, between tubercle and groove for subclavian artery.
Nerve Supply:
Ventral primary rami of spinal nerves C3-C8.
Action:
Function in respiration by lifting the thoracic cage.
If thoracic cage is fixed, they flex cervical vertebral column to
one side or bend it anteriorly when acting in concert
13. Location:
Deep and lateral to the middle scalene.
Origin:
Transverse processes of vertebrae C4–C6 .
Insertion:
Outer surface of second rib.
Nerve Supply:
Ventral primary rami of spinal nerves C5-C7.
Action:
Function in respiration by lifting the thoracic cage.
If thoracic cage is fixed, they flex cervical vertebral column to
one side or bend it anteriorly when acting in concert
14. Location:
Neck and chin
Origin:
Pectoral and deltoid fascia
Insertion:
Inferior border of body of mandible, skin of face .
Nerve Supply:
Cervical.
Action:
Depresses mandible, corner of mouth, and lower lip
15.
16. Location:
Medial to back of neck to the angle of upper few rib.
Origin:
Transverse processes of T1–T5 and
articular processes of vertebrae C4–C7.
Insertion:
Posterior aspect of mastoid process of temporal bone.
Nerve Supply:
Dorsal primary rami of cervical nerves.
Action:
Extends and inclines head laterally.
17. Location:
Deep to semispinalis capitis
Origin:
Transverse process of atlas.
Insertion:
Inferior to the superior nuchal line of the occipital bone .
Nerve Supply:
Dorsal primary ramus of suboccipital nerve (C1).
Action:
Pulls head back and, acting unilaterally tilts it to one side.
18. Location:
Deep to semispinalis capitis and inferior to oblique capitis superior
Origin:
Spinous process of axis .
Insertion:
Transverse process of the atlas.
Nerve Supply:
Dorsal primary ramus of suboccipital nerve (C1).
Action:
Rotates atlanto-axis joint to turn the face laterally.
19. Location:
Medial to the obliquus capitis superior.
Origin:
Spine of the axis, Tubercle of the posterior arch of the atlas.
Insertion:
Below and on the inferior nuchal line of the occipital bone .
Nerve Supply:
Dorsal primary ramus of suboccipital nerve (C1).
Action:
Draws the head back and turns the face laterally.
20. Location:
Deep to the splenius capitis i.e. deep to trapezius.
Origin:
Transverse processes of vertebrae C7–T6 and
articular processes of vertebrae C4–C6
Insertion:
Occipital bone between superior and inferior nuchal lines .
Nerve Supply:
Branches of dorsal primary rami of cervical nerves .
Action:
Extends head and, acting unilaterally tilts it to one side.
21. Location:
Immediately deep to the trapezius .
Origin:
Ligamentum nuchae; spinous processes of vertebrae C7–T4
Insertion:
Mastoid process of temporal bone and lateral 1⁄3 of superior
nuchal line of occipital bone
Nerve Supply:
Dorsal primary rami of middle cervical nerves.
Action:
Pulls head back and rotates .
22. Location:
Most superficial layer covering the back of the neck and upper back
Origin:
External occipital protuberance, superior nuchal line,
ligamentum nuchae, and spinous processes of C7–T12
Insertion:
Lateral 1⁄3 of the clavicle; acromion, spine, and tubercle of
the spine of the scapula
Nerve Supply:
Accessory nerve and ventral primary rami of C3, C4 (proprioception)
Action:
Most of its action is on shoulder in suspending, squaring, shrugging,
& pulling it in. It is also a rotator of the scapula. Fixing the
shoulder, it assists in pulling the head posteriorly and laterally