Chapter 8: Human Muscular System Flashcards
What are the head muscles?
- Occipitofrontalis
- Temporalis
- Orbicularis oculi
- Zygomaticus major
- Orbicularis oris
- Masseter
What is this muscle?
Occipitofrontalis
- Frontal belly
- Occipital belly
What is this muscle?
Temporalis
What is this muscle?
Orbicularis oculi
Action - Closes eye
What is this muscle?
Zygomaticus major
Action - Elevates corner of mouth
What is this muscle?
Orbicularis oris
Action - Purses lips
What is this muscle?
Masseter
Action - Elevates jaw
What are the neck muscles?
- Platysma
- Digastric
- Mylohyoid
- Sternohyoid
- Sternothyroid
- Thyrohyoid
- Scalene(s)
- Sternocleidomastoid
What is this muscle?
Platysma
What is this muscle?
Digastric
(Located under the jaw. Has two heads)
What is this muscle?
Mylohyoid
What is this muscle?
Sternohyoid
What is this muscle?
Sternothyroid
What is this muscle?
Thyrohyoid
What is this muscle?
Scalene
What is this muscle?
Sternocleidomastoid
Action - Flexes neck
(Medial and lateral head)
What are the anterior trunk muscles?
- Pectoralis major
- Pectoralis minor
- Serratus anterior
- External intercostal(s)
- Internal intercostal(s)
- Rectus Abdominus
- External oblique
- Internal oblique
- Transverse abdominis
- Linea Alba (structure not muscle)
- Diaphragm
What is this muscle?
Pectoralis major
Origin - Sternal end of clavicle, sternum, Cartilage of ribs 1-6
Insertion - Greater tubercle of humerus
Action - Flexes arm
What is this muscle?
Pectoralis minor
Action - Protracts and rotates scapula inferiorly
What is this muscle?
Serratus anterior
What is this muscle?
External intercostal
Action - Elevates ribs
What is this muscle?
Internal intercostal
Action - Depresses ribs
What is this muscle?
Rectus Abdominis
Action - Flexes vertebral column
What is this muscle?
External Oblique (what direction do fibers point)
What is this muscle?
Internal oblique
What is this muscle?
Transversus abdominis
What is this structure?
Linea Alba
What is this muscle?
Diaphragm
What muscles are involved in the posterior trunk muscles?
- Trapezium
- Latissimus dorsi
- Splenius capitis
- Levator scapulae
- Rhomboid minor
- Rhomboid major
- Teres Major
- Erector spinae group composed of Spinalis, longissimus, and iliocostalis
What is this muscle?
Trapezium
What is this muscle?
Latissimus dorsi
Origin - Lower 6 thoracic vertebrae via thoracolumbar fascia, lumbar vertebrae and iliac crest
Insertion - Intertubercular sulcus of humerus
Action - Extends arm
What is this muscle?
Splenius capitis
Action - Extends neck
What is this muscle?
Levator scapulae
What is this muscle?
Rhomboid minor
What is this muscle?
Rhomboid major
What is this muscle?
Teres major
What makes up the spinae group?
- Spinalis
- Longissimus
- Iliocostalis
Action - Extends vertebral column
