Lab 4: Pectoral Area and Superficial & Deep Neck Flashcards
AOI
Obliques (External)
Action:
Compression of abdomen, flexion, and rotation of trunk
Origin:
Ribs
Insertion:
Iliac crest
Obliques (Internal)
Action: Compression of abdomen, flexion, and rotation of trunk
Origin: Iliac Crest
Insertion: Ribs
Transverse abdominis
Action: Compression of abdomen
Origin: Ribs and iliac crest
Insertion: Linea alba
Rectus abdominis
Action: Flexion of trunk; compression of abdominal wall
Origin: pubic crest
Insertion: xiphoid process and ribs (5-7)
Intercostals (external and internal)
Action: Elevation and depression of ribs
Origin:
Superior border of ribs (external)
Inferior border of ribs (internal)
Insertion:
inferior borders of ribs (external)
superior borders of ribs (internal)
Diaphragms
Action: Opens thoracic cavity for lungs during inspiration
Origin: Ribs (5-10) and lumbar vertebrae
Insertion: central tendon
Frontalis
Action: raises eyebrows
Origin: epicranial aponeurosis
Insertion: skin of eyebrows and root of nose
Occipitalis
Action: Pulls scalp posteriorly
Origin: Occipital bone
Insertion: Epicranial aponeurosis
Temporalis
Action: Closes jaw; retract mandible
Origin: temporal fossa
Insertion: coronoid process (mandible)
Massester
Action: closes jaw
Origin: zygomatic arch
Insertion: angle and ramus (mandible)
Zygomaticus
Action: elevates corners of mouth
Origin: zygomatic bone
Insertion: corner of mouth
Buccinator
Action: compression of check
Origin: molar region (Maxilla and mandible)
Insertion: orbicularis oris
Platysma
Action: Tenses skin of neck; depression of lower lip
Origin: fascia of chest
Insertion: mandible and corner of mouth
Orbicularis oculi
Action: Closes eyes
Origin: frontal bone and maxilla
Insertion: eyelids
orbicularis oris
Action: closes and protrudes lip
Origin: maxilla and mandible
Insertion: angles of mouth
Levator labii superioris
Action: elevation of upper lip
Origin: zygomatic bone and infraorbial margin (maxilla)
Insertion: upper lip
Depressor labii inferioris
Action: depression of lower lip
Origin: body of mandible
Insertion: lower lip
Sternocleidomastoid
Action: flexion and rotation of neck
Origin: manubrium and clavicle
Insertion: mastoid process (temporal bone)
Serratus anterior
Action: abduction and rotation of scapula
Origin: true ribs
Insertion: medial border (scapula)
Scalenes
Action: Elevation of ribs 1 & 2; rotation of neck
Origin: Transverse processes of cervical vertebrae (C3-C7)
Insertion: Ribs 1-2
Rhomboids
Action: Adduction and elevation of scapula
Origin: spinous processes of vertebrae (C7-T5)
Insertion: medial border (scapula)
Splenius
Action: Rotation of head; extension of neck
Origin: Spinous processes of vertebrae (C7- T6)
Insertion: Temporal and occipital bone
Digastric
Action: Elevation of hyoid; opens mouth
Origin: Lower margin (mandible); mastoid process (temporal bone)
Insertion: hyoid bone
Mylohyoid
Action: Elevation of hyoid and floor of mouth
Origin: Medial surface (mandible)
Insertion: hyoid bone
