Netter's Head and Neck Muscular System

only neck

1

Sternocleidomastoid

• Origin: Manubrium (sternal head), clavicle (clavicular head)

• Insertion: Mastoid process, superior nuchal line

• Action: Tilts and rotates head; flexes neck; aids forced inspiration

2

Digastric (Posterior Belly)

• Origin: Mastoid notch

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid; active in swallowing and chewing

3

Mylohyoid

• Origin: Mylohyoid line of mandible

• Insertion: Hyoid bone and median raphe

• Action: Elevates mouth floor; assists hyoid elevation and mandible depression

4

Digastric (Anterior Belly)

• Origin: Mandible (digastric fossa)

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid

5

Stylohyoid

• Origin: Styloid process

• Insertion: Hyoid bone

• Action: Elevates and retracts hyoid (implied)

6

Platysma (cut)

• Origin/Insertion: Subcutaneous tissue

• Action: Tenses skin of neck (implied)

1

Sternohyoid

• Origin: Manubrium, clavicle

• Insertion: Hyoid bone

• Action: Depresses hyoid

2

Omohyoid (Superior Belly)

• Origin: Intermediate tendon

• Insertion: Hyoid bone

• Action: Depresses hyoid; may tense cervical fascia

3

Omohyoid (Inferior Belly)

• Origin: Scapula

• Insertion: Intermediate tendon

• Action: Depresses hyoid; may tense cervical fascia

4

trachea

5

Sternohyoid (cut)

• Origin: Manubrium, clavicle

• Insertion: Hyoid bone

• Action: Depresses hyoid

6

thyroid gland

7

cricoid cartilage

8

Thyrohyoid

• Origin: Thyroid cartilage

• Insertion: Hyoid bone

• Action: Moves hyoid and larynx during speech and swallowing

9

internal jugular vein

10

Mylohyoid

• Origin: Mylohyoid line of mandible

• Insertion: Hyoid bone and median raphe

• Action: Elevates mouth floor; assists hyoid elevation and mandible depression

11

Digastric (Anterior Belly)

• Origin: Mandible (digastric fossa)

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid

12

hyoid bone

13

facial vein

14

Thyrohyoid

• Origin: Thyroid cartilage

• Insertion: Hyoid bone

• Action: Moves hyoid and larynx during speech and swallowing

1

Sternothyroid

• Origin: Manubrium, first rib cartilage

• Insertion: Thyroid cartilage

• Action: Moves larynx; aids in swallowing and speech

2

Thyrohyoid

• Origin: Thyroid cartilage

• Insertion: Hyoid bone

• Action: Moves hyoid and larynx during speech and swallowing

3

Digastric (Posterior Belly)

• Origin: Mastoid notch

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid; active in swallowing and chewing

4

Stylohyoid

• Origin: Styloid process

• Insertion: Hyoid bone

• Action: Elevates and retracts hyoid (implied)

5

Mylohyoid

• Origin: Mylohyoid line of mandible

• Insertion: Hyoid bone and median raphe

• Action: Elevates mouth floor; assists hyoid elevation and mandible depression

6

Digastric (Anterior Belly)

• Origin: Mandible (digastric fossa)

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid

7

Thyrohyoid

• Origin: Thyroid cartilage

• Insertion: Hyoid bone

• Action: Moves hyoid and larynx during speech and swallowing

8

hyoid bone

9

thyroid cartilage

10

Omohyoid (Superior Belly)

• Origin: Intermediate tendon

• Insertion: Hyoid bone

• Action: Depresses hyoid; may tense cervical fascia

11

cricoid cartilage

12

thyroid gland (isthmus)

13

trachea

14

Sternohyoid (cut)

• Origin: Manubrium, clavicle

• Insertion: Hyoid bone

• Action: Depresses hyoid

1

Omohyoid (Superior & Inferior Bellies)

• Origin: Scapula (inferior belly), intermediate tendon (superior belly)

• Insertion: Intermediate tendon (inferior), hyoid bone (superior)

• Action: Depresses hyoid; may tense cervical fascia

2

Sternohyoid

• Origin: Manubrium, clavicle

• Insertion: Hyoid bone

• Action: Depresses hyoid

3

Thyrohyoid

• Origin: Thyroid cartilage

• Insertion: Hyoid bone

• Action: Moves hyoid and larynx during speech and swallowing

4

Stylohyoid

• Origin: Styloid process

• Insertion: Hyoid bone

• Action: Elevates and retracts hyoid (implied)

5

Digastric (Posterior Belly)

• Origin: Mastoid notch

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid; active in swallowing and chewing

6

Sternocleidomastoid

• Origin: Manubrium (sternal head), clavicle (clavicular head)

• Insertion: Mastoid process, superior nuchal line

• Action: Tilts and rotates head; flexes neck; aids forced inspiration

7

Scalenus (Anterior, Medius, Posterior)

• Origin: Cervical transverse processes

• Insertion: First rib

• Action: Flexes and rotates neck; elevates rib (inspiration)

1

Stylohyoid

• Origin: Styloid process

• Insertion: Hyoid bone

• Action: Elevates and retracts hyoid (implied)

2

Thyrohyoid

• Origin: Thyroid cartilage

• Insertion: Hyoid bone

• Action: Moves hyoid and larynx during speech and swallowing

3

Omohyoid (Superior & Inferior Bellies)

• Origin: Scapula (inferior belly), intermediate tendon (superior belly)

• Insertion: Intermediate tendon (inferior), hyoid bone (superior)

• Action: Depresses hyoid; may tense cervical fascia

4

Sternohyoid

• Origin: Manubrium, clavicle

• Insertion: Hyoid bone

• Action: Depresses hyoid

5

hyoid bone (body)

6

mylohyoid raphe

7

trochlea for intermediate tendon of digastric muscle

8

Digastric (Anterior Belly)

• Origin: Mandible (digastric fossa)

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid

9

Mylohyoid

• Origin: Mylohyoid line of mandible

• Insertion: Hyoid bone and median raphe

• Action: Elevates mouth floor; assists hyoid elevation and mandible depression

10

Hyoglossus

• Origin: Hyoid bone

• Insertion: Side of tongue

• Action: Depresses and retracts tongue

11

ramus of the mandible

12

coronoid process

13

mastoid process

14

Digastric (Posterior Belly)

• Origin: Mastoid notch

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid; active in swallowing and chewing

1

Digastric (Anterior and Posterior Bellies)

• Origin: Anterior Belly: mandible (digastric fossa), posterior belly: mastoid notch

• Insertion: Intermediate tendon to hyoid

• Action: Depresses mandible, elevates hyoid (posterior: active in swallowing and chewing)

2

mastoid process

3

external acoustic meatus

4

styloid process of temporal bone

5

coronoid process

6

ramus of mandible

7

mental foramen

8

trochlea for intermediate tendon of digastric muscle

9

Sternohyoid

• Origin: Manubrium, clavicle

• Insertion: Hyoid bone

• Action: Depresses hyoid

10

Omohyoid (Superior & Inferior Bellies)

• Origin: Scapula (inferior belly), intermediate tendon (superior belly)

• Insertion: Intermediate tendon (inferior), hyoid bone (superior)

• Action: Depresses hyoid; may tense cervical fascia

11

Thyrohyoid

• Origin: Thyroid cartilage

• Insertion: Hyoid bone

• Action: Moves hyoid and larynx during speech and swallowing

12

Mylohyoid

• Origin: Mylohyoid line of mandible

• Insertion: Hyoid bone and median raphe

• Action: Elevates mouth floor; assists hyoid elevation and mandible depression

13

Hyoglossus

• Origin: Hyoid bone

• Insertion: Side of tongue

• Action: Depresses and retracts tongue

14

Stylohyoid

• Origin: Styloid process

• Insertion: Hyoid bone

• Action: Elevates and retracts hyoid (implied)

1

Scalenus (Anterior, Medius, Posterior)

• Origin: Cervical transverse processes

• Insertion: First rib

• Action: Flexes and rotates neck; elevates rib (inspiration)

1

Longus Capitis

• Origin: Cervical transverse processes

• Insertion: Occipital bone

• Action: Flexes head

2

Longus Colli

• Origin: Cervical and upper thoracic vertebrae

• Insertion: Cervical vertebrae and atlas

• Action: Flexes neck

3

Scalenus (Anterior, Medius, Posterior)

• Origin: Cervical transverse processes

• Insertion: First rib

• Action: Flexes and rotates neck; elevates rib (inspiration)

4

atlas

5

axis