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Skeletal Muscle Groups. Ready or not, here we go!. A. Muscles of Facial Expression. 1. Frontalis A: elevates eyebrows O: occipital bone I: skin of eyebrow 2. Occipitalis A: pulls scalp posterior O: mastoid process of occipital bone I: galea aponeurotica. 3. Orbicularis oculi

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skeletal muscle groups

Skeletal Muscle Groups

Ready or not, here we go!

a muscles of facial expression
A. Muscles of Facial Expression

1. Frontalis

  • A: elevates eyebrows
  • O: occipital bone
  • I: skin of eyebrow

2. Occipitalis

  • A: pulls scalp posterior
  • O: mastoid process of occipital bone
  • I: galea aponeurotica
slide3
3. Orbicularis oculi
  • A: closes eyelid
  • O: frontal & maxillary bones
  • I: skin around eyelid

4. Orbicularis oris

  • A: closes lips
    • Kissing, speaking
  • O: facia surrounding lips
  • I: corners of mouth
slide4
5. Zygomaticus Major/Minor
  • A: Retracts & elevates corners of mouth
    • smiling
  • O: zygomatic bone
  • I: corner of mouth/upper lip

6. Buccinator- “kissing muscle”

  • A: compresses cheeks
    • Sucking, whistling, blowing
  • O: mandible & maxillary bones
  • I: orbicularisoris
slide5

7. Depressor angulioris

  • A: Depresses corner of mouth
  • O: Anterolateral surface of mandibular body
  • I: Skin at corner of mouth
b muscles of mastication
B. Muscles of Mastication

1. Masseter- strongest jaw muscle

  • A: elevates the mandible
    • Closes mouth
  • O: zygomatic arch
  • I: mandibular ramus

2. Temporalis

  • A: elevates mandible
  • O: temporal bone
  • I: coronoid process of mandible
c muscles of the neck
C. Muscles of the Neck

1. Platysma

  • A. Depresses mandible, tenses neck
  • O: Upper thorax between cartilage of 2nd rib & acromion process
  • I: Mandible & skin of cheek

2. Sternocleidomastoid

  • A: flexes head, turns head side to side
  • O: clavicle & manubrium
  • I: mastoid process of temporal bone
slide10

3. Omohyoid

  • A. Depresses hyoid & larynx
  • O: Central tendon attaches to clavicle & 1st rib
  • I: 2 bellies:
    • Superior- hyoid bone
    • Inferior- superior margin of scapula

4. Sternohyoid

  • A: Depresses hyoid & larynx
  • O: Clavicle & manubrium
  • I: Hyoid bone
quiz tomorrow

Quiz Tomorrow!

Head & Neck Muscles

d muscles of the pectoral girdle
D. Muscles of the Pectoral Girdle

1. Trapezius

  • A: extends head & elevates scapula
    • Look up & shrugs shoulders
  • O: occipital bone & thoracic & cervical vertebrae
  • I: clavicle & scapula

2. Serratus Anterior

  • A: Abduction, upward rotation, protracts shoulder
  • O: Anterior & superior margins of ribs 1-9
  • I: Anterior surface of medial border of scapula
slide14

3. Rhomboid Major/Minor

  • A: Adduction, downward rotation
  • O:
    • Major: Spinus processes of upper thoracic vertebra
    • Minor: Spinus processes of cervical vertebrae
  • I: Vertebral border of scapula

4. Pectoralis Minor

  • A: elevates ribs (breathing) & depresses shoulders
  • O: ribs 3-5
  • I: coracoid process of scapula
e muscles of the shoulder upper arms
E. Muscles of the Shoulder & Upper Arms

1. Pectoralis Major

  • A: adducts & flexes humerus, rotates arms medially
  • O: clavicle, sternum, & costal cartilage
  • I: greater tubercle of humerus

2. Deltoid

  • A: abducts humerus
  • O: clavicle & scapula
  • I: deltoid tuberosity of humerus
rotator cuff muscles
(Rotator Cuff Muscles)

3. Supraspinatus

  • A: Abduction, stabilization
  • O: Supraspinousfossa of scapula
  • I: Greater tubercle of humerus

4. Infraspinatus

  • A: Adduction, outward rotation
  • O: Infraspinousfossa of scapula
  • I: Greater tubercle of humerus
rotator cuff muscles1
(Rotator Cuff Muscles)

5. Teres Minor

  • A: Adduction, outward rotation
  • O: Inferior angle of scapula
  • I: Medial lip of intertubercular groove of humerus

6. Subscapularis

  • A: Adduction, inward rotation
  • O: Subscapularfossa of scapula
  • I: Lesser tubercle of humerus
slide20
7. Teres Major
  • A: Adduct, inward rotation, extension
  • O: Inferior angle of scapula
  • I: Medial lip of intertubercular groove of humerus

8. LatissimusDorsi

  • A: extends, adducts, & rotates arms medially
  • O: spines of T7-sacrum, iliac crest, & ribs 9-12
  • I: intertubercular groove of humerus
slide21
9. Biceps Brachii- “two heads”
  • A: flexes arm @ elbow, supinates forearm
  • O: scapula
  • I: radial tuberosity

10. Triceps Brachii- “three heads”

  • A: extends arm (antagonist to biceps brachii)
  • O: scapula & humerus
  • I: olecranon process of ulna
slide22

11. Coracobrachialis

  • A: Adduction, flexion
  • O: Coracoid process
  • I: Medial margin of shaft of humerus
f muscles of the forearm
F. Muscles of the Forearm

1. Brachioradialis

  • A: flexes arm @ elbow, supinates forearm
  • O: lateral epicondyle of humerus
  • I: styloid process of ulna

2. Brachialis

  • A: Flexion
  • O: Anterior distal surface of the humerus
  • I: Tuberosity of ulna
mentioned previously
(mentioned previously)

3. Biceps Brachii

  • A: Flexion, supination
  • O: scapula
  • I: radial tuberosity

4. Triceps Brachii

  • A: extends arm
  • O: scapula & humerus
  • I: olecranon process of ulna
g muscles of the hand wrist
G. Muscles of the Hand & Wrist

1. Flexor Carpi Radialis

  • A: Flexion & abducts wrist & hand
  • O: Medial epicondyle of humerus
  • I: Base of 2nd & 3rd metacarpals

2. Palmaris Longus

  • A: Flexion of the wrist and hand
  • O: Medial epicondyle of humerus
  • I: Palmaraponerosis & flexor retinaculum
slide29

3. Flexor Carpi Ulnaris

  • A: Flexion & adduction of wrist & hand
  • O: Medial epicondlye of humerus, medial surface of olecranon, anteromedial part of ulna
  • I: Pisiform & hamate bones & 5th metacarpal

4. Extensor Carpi RadialisLongus

  • A: Extension & abduction of wrist & hand
  • O: Lateral supracondylar ridge of humerus
  • I: 2nd metacarpal
slide30

5. Extensor Digitorum

  • A: Extension of the fingers & hand
  • O: Lateral epicondyle of humerus
  • I: Posterior surfaces of phalanges 2-5

6. Extensor Carpi Ulnaris

  • A: Extension & adduction of wrist & hand
  • O: Lateral epicondyle of humerus, dorsal surface of ulna
  • I: Base of 5th metacarpal
quiz tomorrow1

Quiz Tomorrow

Shoulder, Arm, Forearm, Wrist & Hand Muscles

g muscles of the abdomen
G. Muscles of the Abdomen

1. Rectus Abdominis

  • A: depresses rib cage & flexes vertebral column
  • O: pubic symphysis
  • I: costal cartilage of ribs 5-7 & xiphoid process

2. External Oblique

  • A: compresses abdomen, flexes vertebral column & lateral rotation
  • O: ribs 5-12
  • I: iliac crest & linea alba
slide35
3. Internal Oblique
  • A: same as external oblique
  • O: iliac crest
  • I: costal cartilage of ribs 8-12 & linea alba

4. Transversus Abdominis

  • A: compresses abdomen
  • O: iliac crest & costal cartilage of ribs 7-12
  • I: pubis, linea alba, & xiphoid process
slide36
3. Diaphragm- separates thoracic & abdominopelvic cavities
  • A: expands thorax
  • O: costal cartilage of ribs 7-12 & xiphoid process
  • I: central tendon of diaphragm
quiz tomorrow2

Quiz Tomorrow

Abdominal Muscles

h muscles of the hip thigh
H. Muscles of the Hip & Thigh

1. Iliacus

  • A: Flexion, outward rotation
  • O: Iliac fossa
  • I: Distal femur

2. Psoas Major

  • A: Flexion, outward rotation
  • O: Anterior surfaces of vertebrae T12- L5
  • I: Lesser trochanter of femur
slide41

3. Rectus Femoris (part of Quadriceps)

  • A: Flexion
  • O: Anterior inferior iliac spine & superior rim of acetabulum
  • I: Tibial tuberosity via patellar ligament

4. Sartorius

  • A: Flexion, outward rotation
  • O: Anterior, superior iliac spine
  • I: Medial tibia
slide42
5. Gracilis
  • A: Adduction
  • O: Inferior ramus of pubis
  • I: Medial surface of tibia inferior to medial condyle

6. Pectineus

  • A: Flexion, adduction
  • O: Superior ramus of pubis
  • I: Inferior to lesser trochanter of femur
slide43
7. Adductor Longus
  • A: Adduction, flexion
  • O: Inferior ramus of pubis
  • I: lineaaspera of femur

8. Gluteus Maximus

  • A: extends & laterally rotates thigh
  • O: iliac crest, sacrum, & coccyx
  • I: femur
hamstrings group
(Hamstrings Group)

9. Semitendinosus

  • A: Extension
  • O: Ischial tuberosity
  • I: Proximal, medial surface of tibia

10. Semimembranosus

  • A: Extension
  • O: Ischial tuberosity
  • I: Posterior surface of medial condyle of tibia
hamstrings group1
(Hamstrings Group)

11. Biceps Femoris

  • A: Extension
  • O: Ischial tuberosity and lineaaspera of femur
  • I: Head of fibula, lateral condyle of tibia
slide46

12. Tensor Fasciae Latae

  • A: Flexion, stabilizes knee
  • O: Iliac crest & anterior superior iliac spine
  • I: Iliotibial tract

13. Gluteus Medius

  • A: Abduction
  • O: Anterior iliac crest
  • I: Greater trochanter of femur
i muscles of the knee joint
I. Muscles of the Knee Joint

1. Sartorius- mentioned previously

  • A: Flexion

2. Gracilis- mentioned previously

  • A: Flexion

3. Gastrocnemius

  • A: Flexion
  • O: lateral & medial epicondyles of femur
  • I: calcaneus
quadriceps group
(Quadriceps Group)

4. Rectus Femoris- mentioned previously

  • A: Extension

5. VastusLateralis

  • A: Extension
  • O: Anterior & inferior to greater trochanter & lineaaspera
  • I: Tibial tuberosity
quadriceps group1
(Quadriceps Group)

6. VastusMedialis

  • A: Extension
  • O: Entire length of lineaaspera of femur
  • I: Tibial tuberosity

7. VastusIntermedius

  • A: Extension
  • O: Anterolateral surface of femur & lineaaspera
  • I: Tibial tuberosity
hamstrings group2
(Hamstrings Group)

8. Semitendinosis- mentioned previously

  • A: Flexion

9. Semimembranosus- mentioned previously

  • A: Flexion

10. Biceps Femoris- mentioned previously

  • A: Flexion
j muscles of the ankle joint
J. Muscles of the Ankle Joint

1. Tibialis Anterior

  • A: dorsiflexes ankle, inverts foot
  • O: lateral epicondyle & body of tibia
  • I: 1st metatarsal

2. Fibularis (Peroneus) Longus

  • A: Everts and plantar flexes foot, supports arch
  • O:lateral condyle of tibia, head of fibula
  • I: base of 1st metatarsal, medial cuneiform bone
slide52
3. Gastrocnemius- mentioned previously
  • A: Plantar flexes foot

4. Soleus

  • A: plantar flexes foot
  • O: posterior fibular & tibia
  • I: calcaneus
next week
Next Week
  • We will start dissecting the fetal pigs Friday. I would like you to work in these pairs:
    • Sara & Alyssa
    • Kelly & Jamie
    • Cecily & Travis Megan will be working
    • Bethany & Jordan on a special project for
    • Andrew & Renee me on her own.
    • Max & Amanda
    • Emma & Jacob
dissection details
Dissection Details
  • I will assign each pair a specific muscle group to start with, and if your group completes that dissection, you may go on to dissect the rest of the pig.
  • You must dress appropriately for the lab:
    • Close-toed shoes
    • No loose clothing/jewelry (unless you want pig juice on them!)
    • Hair must be tied back (ditto to the above comment- I hear it’s a great conditioner!)
    • No food or drink while we’re dissecting
grading for the dissection
Grading for the Dissection
  • Each day we dissect you will receive a participation grade.
  • You will also be graded on how well you dissect/identify your assigned muscle group.
  • I may look into giving some extra points for dissecting more than just your assigned muscles.
  • You will lose participation points if you are gone for a lab day (we’ll talk if it’s excused).