Frog Muscles with OIA

Frog Muscles © Cloie Anne Rabinetas MUSCLES

Description

Origin (O)

Insertion (I)

1

Action (A)

SUPERFICIAL MUSCLES OF THE LOWER JAW, CHEST AND ABDOMEN MYLOHYOID ANTERIOR PECTORALIS MIDDLE PECTORALIS POSTERIOR PECTORALIS

A broad sheet of muscle across the lower jaw The most anterior chest muscle posterior to the mylohyoid The middle chest muscle posterior to the anterior pectoralis The most posterior chest muscle posterior to the preceding

Lower jaw

Median line

Raises the floor of the mouth

Coracoid and Epicoracoid

Humerus

Sternum and Xiphisternum

Humerus

Draws the arm towards the chest

Rectus abdominis

Humerus

Draws the arm towards the chest

DELTOID

Consists of an anterior and posterior region near the median line along the forward border of the pectoralis muscles and lies in front of the pectoralis

Median line

Humerus

Pulls the arm forward

BICEPS BRACHII

A slender muscle posterior to the deltoid

Episternum

Radio-ulna

Flexes the forearm

RECTUS ABDOMINIS

Muscle at the midventral portion of the abdomen which extends from the pubis to the sternum; divided at the middle by the linea alba; transversely divided into segments by means of connective tissue septa, the inscriptiones tendinae

Pubis

Sternum

Supports the abdomen and holds the sternum

EXTERNAL OBLIQUE

Large muscle covering the sides of the body

Rectus abdominis and Dorsal fascia

Linea alba

Compresses the abdomen

Frog Muscles © Cloie Anne Rabinetas

2

SUPERFICIAL MUSCLES OF THE HEAD AND BACK MASSETER

Muscle found lying infront of the tympanum

Tympanic ring

Lower jaw posterior to the temporalis

Closes the mouth

DEPRESSOR MANDIBULARIS

Muscle found Tympanic ring and Lower jaw Opens the mouth behind the Dorsal fascia tympanum TEMPORALIS Round muscle on Side of the skull Near the posterior Closes the mouth the dorsal part just between eye and of the lower jaw above the tympanic ring depressor Mandibularis LATISSIMUS DORSI A fan shaped Dorsal fascia Humerus Swings the forearm muscle lying dorsal outward and to the suprascapula upward and scapula LONGISSIMUS DORSI Lies between the Sacral vertebra and Suprascapula and Raises the back suprascapula and illium dorsal fascia sacral vertebra MUSCLES OF THE THIGH AND SHANK ON THE DORSAL SIDE OF THE THIGH TRICEPS FEMORIS

A large muscle covering the entire anterior border of the thigh both dorsally and ventrally

Pelvic girdle

Tibio-fibula

Adducts the thigh and extends the shank

SEMIMEMBRANOSUS

A large muscle lying on the posterior margin of the dorsal surface of the thigh; characterized by the presence of oblique markings, running across it from the ischium

Ischium

Tibio-fibula

Adducts the thigh and flexes the shank

BICEPS FEMORIS

A long slender muscle between the triceps femoris and semimembranosus A slender muscle above the semimembranosus

Ischium

Tendon on the knee and fascia of the shank

Adducts the thigh and flexes the legs

Ischium

Tibio-fibula

Adducts the femur and flexes the legs

SEMITENDINOSUS

Frog Muscles © Cloie Anne Rabinetas

3

ON THE VENTRAL SIDE OF THE THIGH SARTORIUS

ADDUCTOR LONGUS

ADDUCTOR MAGNUS

A long slender muscle running obliquely from the ilium to the tibia A narrow muscle partly covered by the Sartorius at the distal end but partly exposed at the proximal end

Ilium

Tibio-fibula

Flexes the shank and adducts the thigh

Ilium

Femur

Pulls the thigh forward and ventrad

A stout muscle lying behind the Sartorius and partly covered by it. You may cut the sartorius across its belly, to have a full view of this muscle

Ischium and Pubis

Femur

Adducts the thigh and leg

GRACILIS MAJOR/RECTUS INTERNUS MAJOR GRACILIS MINOR/RECTUS INTERNUS MINOR

A large muscle lying Ischium Tibio-fibula at the posterior margin of the thigh A long slender Ischium Tibio-fibula muscle closely attached at the posterior side of the gracilis major ON THE DORSAL SIDE OF THE SHANK

Flexes the shank and adducts the thigh Flexes the shank and adducts the thigh

GASTROCNEMIUS

A large muscle at the back of the shank which tapers at its end A stout muscle with two bellies at the distal end; lies close to the anterior surface of the tibiofibula

Femur

Tendon of Achilles

Extends the foot and flexes the shank

Femur

Tibiale and fibulare

Extends the leg and flexes the foot

A slender muscle lying between the tibialis anticus and gastrocnemius and partly covered by the latter

Femur

Tibio-fibula and Fibulare

Draws the shank against the thigh, extends and twists the foot

TIBIALIS ANTICUS

PERONEUS

Frog Muscles © Cloie Anne Rabinetas

4

ON THE VENTRAL SIDE OF THE SHANK TIBIALIS POSTICUS

EXTENSOR CRURIS

A long narrow muscle close to the posterior side of the tibia beneath the gastrocnemius slender muscle lying on the proximal side of the tibio-fibula and partly covered by the tibialis anticus

Femur

Astragsalus

Flexes and twists the ankle

Femur

Tibio-fibula

Extends the shank

*Gastrocnemius, Tibialis anticus and Peroneus are also seen on the dorsal side.

Taken from Laboratory Exercises in BIOLOGY 102 (2002) of the Department of Biological Sciences College of Science University of Santo Tomas