Download External Anatomy and Muscular System of the Frog and more Lab Reports Zoology in PDF only on Docsity!
THE EXTERNAL ANATOMY OF THE FROGTHE EXTERNAL ANATOMY OF THE FROG
THE SKELETAL MUSCLE BUNDLETHE SKELETAL MUSCLE BUNDLE
THE SKELETAL MUSCLE BUNDLE
(VENTRAL SIDE)
THE SKELETAL MUSCLE BUNDLE
(VENTRAL SIDE)
1. Fascia
Skeletal muscle fibers are
bound together by though
connective tissue called
fascia. This connective
tissue extends beyond the
ends of the muscle fibers
into the muscle attachment.
2. Tendon
If the muscle it covers is
spindle-shaped or thick
muscles, the connective
tissue forms tendon which
is cylindrical, thick, cord-
like mass.
3. Aponeurosis
A broad and sheet-like
connective tissue called
aponeurosis is at the end of
flat muscles like the
abdominal wall
musculature.
4. Median Raphe
THE SKELETAL MUSCLE BUNDLETHE SKELETAL MUSCLE BUNDLE
THE SKELETAL MUSCLE BUNDLE
(VENTRAL SIDE)
THE SKELETAL MUSCLE BUNDLE
(VENTRAL SIDE)
1. Fascia
Skeletal muscle fibers are
bound together by though
connective tissue called
fascia. This connective
tissue extends beyond the
ends of the muscle fibers
into the muscle attachment.
2. Tendon
If the muscle it covers is
spindle-shaped or thick
muscles, the connective
tissue forms tendon which
is cylindrical, thick, cord-
like mass.
3. Aponeurosis
A broad and sheet-like
connective tissue called
aponeurosis is at the end of
flat muscles like the
abdominal wall
musculature.
4. Median Raphe
DORSAL MUSCLES OF THE FROG
(THIGH)
DORSAL MUSCLES OF THE FROG
(THIGH)
- Triceps femoris
the largest & the most anterior three- headed muscle of the thigh, these are
a. a dorsal vastus externus b. a middle rectus femoris anticus c. a ventral vastus internus
11
11a
11b
11c
- Gluteus
a small but thick muscle found anterior to the vastus externus and medial to the
rectus femoris anticus
13. Biceps femoris or
iliofibularis
a slender muscle posterior to
the triceps with its proximal
end being covered by vastus
externus
14. Semimembranosus
a large muscle with oblique
markings found immediately
posterior to the biceps
femoris
15. Piriformis
a slender, short muscle
found between the vastus
externus and the proximal
end of the
semimembranosus
DORSAL MUSCLES OF THE FROG
(SHANK)
DORSAL MUSCLES OF THE FROG
(SHANK)
- Gastrocnemius
the largest & the most
posterior muscle of the
shank
- Peroneus
the muscle immediately
anterior to the
gastrocnemius & partly
covered by it
- Tibialis anticus
the most anterior muscle of
the shank and splits distally
into two slips partially seen
on the dorsal side & partly
on the ventral side but is
best viewed when the frog is
turned laterally
VENTRAL MUSCLES OF THE FROG
(THIGH)
VENTRAL MUSCLES OF THE FROG
(THIGH)
- triceps femoris
- Sartorius
the most ventral, flat muscle of the thigh that runs obliquely downwards
- Adductor longus
by freeing the Sartorius, cutting through its belly & deflecting its halves this narrow, flat muscle will be seen underneath it. Even without cutting the Sartorius, it could be partly seen on the postero-ventral side of the triceps.
- Adductor magnus
a thick, triangular muscle posterior to the adductor longus
- Gracilis major or rectus internus major
a large muscle with oblique markings along its belly and situated immediately posterior to the adductor magnus
- Gracilis minor or rectus internus minor
a long, narrow strip of muscle on the posterior margin of the thigh
- Semitendinosus
a two-headed muscle lying posterior to the femur and is best seen by separating the gracilis major from the adductor magnus
- Gastrocnemius
- Tibialis posticus
a long, narrow but thick muscle anterior to the gastrocnemius
- Extensor cruris
a short slender muscle on the anterior proximal half of the tibio-fibula
- Flexor tarsi anterior
a narrow muscle distal to extensor cruris
- Tibialis anticus
17
18
22 21
24
23
25
