Lab 7 - Muscles 2: Head & Torso Flashcards
Elevates Eyebrows and Skin of Forehead
Epicranius
Squinting; Blinking
Orbicularis Oculi
Puckers Lips (kissing, whistling)
Orbicularis Oris
Smiling
Zygomaticus Major & Zygomaticus Minor
Compresses Cheeks; Sucking (nursing infants)
Buccinator
Elevate Mandible (in mastication)
- Masseter
2. Temporalis
Flexion of Head
Sternocleidomastoid
Hyperextension of Head
Trapezius
Involved in Inhalation and Exhalation (located between the ribs)
Intercostals
Prime mover for Inhalation
Diaphragm
Flexes the Trunk
Rectus Abdominis
Rotate and laterally Flex the Trunk
- External Oblique
2. Internal Oblique
Increases intra-abdominal pressure
Transversus Abdominis
Sternocleidomastoid ~ Origin
- sternum (manubrium)
- clavicle (medial portion)
Sternocleidomastoid ~ Insertion
Mastoid Process of Temporal Bone
Pectoralis Major ~ Origin
- Clavicle
- Sternum
- Cartilage of Ribs 1-7
Pectoralis Major ~ Insertion
Greater Tubercle of Humerus
Latissimus Dorsi ~ Origin
- T7-T12 Vertebrae
- Lumbar Vertebrae
- Lower Ribs
- Iliac crest
Latissimus Dorsi ~ Insertion
Intertubercular Groove of Humerus