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A&P I > Muscles > Flashcards

Muscles Flashcards

(59 cards)

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1
Q

Actions

A

Are movement resulting from the contraction of a muscle or group of muscles

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2
Q

Prime movers

A

Are the most efficient muscles for a particular action

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3
Q

Agonist

A

Contracts to cause an action

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4
Q

Antagonist

A

Opposes or counters the agonist

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5
Q

Synergist

A

Aid in agonist

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6
Q

Fixators

A

Stabilize the origin of an agonist

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7
Q

(Facial expression)

Frontalis

A

Anterior part of epicarnius, & serves to elevate the eyebrows

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8
Q

(Facial expression)

Occipitalis

A

Posterior part of epicranius, it dread scalp posteriorly

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9
Q

(Facial expressions)

Orbicularis oculi

A

Closes eye, squinting

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10
Q

(Facial expressions)

Orbicularis Oris

A

Closes mouth, purses lips

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11
Q

(Facial expressions)

Zygomaticus

A

Elevates corner of mouth

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12
Q

(Facial expressions)

Risorius

A

Draws corner of mouth laterally

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13
Q

(Muscles of mastication)

Buccinator

A

Compressed cheek, holds food b/t teeth

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14
Q

(Muscles of mastication)

Medial/lateral pterygoids

A

Grinding of teeth; medial pterygoid elevates mandible while lateral pterygoid protracts jaw

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15
Q

(Muscles of mastication)

Temporalis

A

Elevates jaw

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16
Q

(Muscles of mastication)

Masseter
O & I

A

Elevates jaw

Origin: zygomatic arch; maxilla
Insert: angle, ramus of mandible

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17
Q

(Muscles of the neck)

Sternocleidomastoid
O & I️

A

Bilaterally: cervical flexion; unilaterally: cervical rotation to opposite side

O: manubrium, medial clavicle
I: mastoid process (part of temporal bone)

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18
Q

(Muscles of the neck)

Platysma

A

Depresses mandible

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19
Q

(Muscles of the neck)

Scalenes

A

Flex & slightly rotates the neck

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20
Q

(Muscles of thorax acting on the scapula)

Trapezius

A

Upper portion: elevates scapula; middle portion: adducts scapula
Lower portion: depresses scapula

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21
Q

(Muscles of thorax acting on the scapula)

Pectoralis minor
O & I️

A

Abducts scapula

O: clavicle, sternum, ribs 1-6
I️: intertubercular sulcus Of humerus

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22
Q

(Muscles of thorax acting on the scapula)

Serratus anterior

A

Abducts scapula

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23
Q

(Muscles of thorax acting on the scapula)

Rhomboids

A

Adduct scapula

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24
Q

(Muscles of thorax participating in respiration)

Intercostals

Study These Flashcards
A

Respiration
(externals: inspiration contracts)
(Internals: expiration relaxes)

25
(Muscles of thorax participating in respiration) Diaphragm
Inspiration
26
(Muscles of the shoulder) Rotator Cuff
``` SITS: Supraspinatus Infraspinatus Teres Subscapularis ``` Arise from scapula
27
(Muscles of the shoulder) Supraspinatus
Abducts humerus
28
(Muscles of the shoulder) Infraspinatus
Laterally rotates humerus
29
(Muscles of the shoulder) Teres Minor
Laterally rotates humerus; rotator cuff
30
(Muscles of the shoulder) Teres Major
Adducts, extends, medially rotates humerus
31
(Muscles of the shoulder) Subscapularis
Medially rotates humerus
32
(Muscles of the shoulder) Pectoralis major
Adducts, medially rotates humerus
33
(Muscles of the shoulder) Deltoid
Abducts humerus
34
(Muscles of the shoulder) Latissimus dorsi
Adducts, extends, medially rotates humerus
35
(Muscles of the upper extremity (arm & forearm)) Triceps brachii
Elbow extension
36
(Muscles of the upper extremity (arm & forearm)) Biceps brachii O & I
Elbow flexion, supinates forearm O: caracoid process, supraglenoid tubercle of scapula I: radial tuberosity
37
(Muscles of the upper extremity (arm & forearm)) Pronator teres
Pronates forearm
38
(Muscles of the upper extremity (arm & forearm)) Flexor carpi radialis
Wrist flexion
39
(Muscles of the upper extremity (arm & forearm)) Extensor carpi radialis longus
Wrist extension
40
(Muscles of the upper extremity (arm & forearm)) Supinator
Supinates forearm
41
(Muscles of the back) Erector spinae
Extends vertebral column
42
(Muscles of the abdomen) Rectus abdominus
Trunk flexion
43
(Muscles of the abdomen) Internal/External obliques
Trunk rotation & lateral flexion; bilaterally, assists in flexion
44
(Muscles of the abdomen) Transverse abdominus
Abdominal compression
45
(Muscles acting on the hip) Iliopsoas
(Ilicus + Psoas major) | Hip flexion
46
(Muscles acting on the hip) Gluteus Maximus O & I
Hip extension O: dorsal ilium, sacrum, coccyx I️: Gluteal tuberosity of femur
47
(Muscles acting on the hip) Gluteus medius
Hip abduction
48
(Muscles acting on the hip) Tensor fascia latae
Hip abduction
49
(Muscles acting on the hip) Adductor magnus
Hip adduction
50
(Muscles acting on the hip) Gracilis
Hip adduction
51
(Muscles acting on the hip) Sartorius
Hip & knee flexion, laterally rotates femur O:anterior superior iliac spine (ASIS) I️: medial proximal tibia
52
(Muscles acting on the hip) Rectus femoris O & I
Hip flexion, knee extension O:anterior inferior iliac spine (AIIS) I️: tibial tuberosity, patella
53
(Muscles acting on the hip) Hamstrings
Hip extension; knee flexion
54
(Muscles of the lower extremity) Quadriceps
Knee extension, hip flexion 4 in group consisting: 1. Rectus femoris 2. Vastus lateralis 3. Vastus medialis 4. Vastus intermedius
55
(Muscles of the lower extremity) Hamstrings
``` Knee flexion, hip extension 3 consisting in groups 1. Biceps femoris (lateral) 2. SemiTendinosus (medial; more superficial) 3. Semimembranosus (most medial) ``` All extends thigh; flexes leg 2&3 Semi’s medially rotates leg 1 Biceos f. Laterally rotates leg
56
(Muscles of the lower extremity) Tibialis anterior
Dorsiflexion
57
(Muscles of the lower extremity) Gastrocnemius O & I️
Plantar flexion O: medial & lateral femoral condyles I️: calcaneus
58
(Muscles of the lower extremity) Soleus
Plantar flexion
59
Muscle origins & insertions
Origin: doesn’t move; stable; fix end Insertion: moving; immobile end

A&P I (3 decks)

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