blood vascular system of prawn paleomon

1. SUBMITTED TO SUBMITTED BY
DR. AMITA SAXENA KARAN ARYA
(SUBJECT TEACHER) ID -56442
COURSE CODE-FRM-121

2. BLOOD VASCULAR SYSTEM
BLOOD VASCULAR SYSTEM OF PRAWN IS OPEN TYPE OR LACUNAR TYPE OF
BLOOD VASCULAR SYSTEM. THIS TYPE OF VASCULAR SYSTEM IS
CHARACTERIZED BY ABSENCE OF CAPILLARIES SO THE BLOOD FLOW
THROUGH OPEN SPACES, THE LACUNAE AND SINUSES, IN BODY. BLOOD
VASCULAR SYSTEM PRAWN INCLUDE-
1 .PERICARDIUM
2. HEART
3. ARTERIES
4. BLOOD LACUNAE OR SINUSES
5. BLOOD CHANNEL
6. BLOOD
THERE ARE NO CAPILLARIES OR VEINS AS IN VERTEBRATES.

3. PERICARDIUM
IT IS A THIN WALLED SPACEOUS HAEMOCOELOMIC CHAMBER CONTAINING
THE HEART, LYING ABOVE THE HEPATO PANCREAS AND GONADS.
THE FLOOR OF THE PERICARDIUM IS IN THE FORM OF A THIN HORIZONTAL
SEPTUM, WHICH IS ATTACHED IN FRONT AND BEHINDTO THE DORSAL BODY
WALL AND ON THE LATERAL SIDES TO THE THORACIC WALL.
HEART
THE HEART IS A TRIANGULAR MUSCULAR STRUCTURE SUSPENDED IN THE
PERICARDIUM BY THREE MUSCLE STRANDS.A MEDIAN LONGITUDINAL
CARDIOPYLORIC STRAND EXTENDS FROM THE APEX OF THE PYLORIC
STOMACH. THE TWO LATERAL STRANDS EXTEND FROM THE LATERAL
ANGELS OF THE HEART TO THE BODY WALL. THE BODY OF HEART IS
PERFORATED BY FIVE PAIRS OF SLIT-LIKE APERTURES CALIED OSTIA.
THE FIRST PAIR OF OSTIA IS SITUATED MID-DORSALLY, 2ND
PAIR
MIDVENTRALLY, 3RD
PAIR POSTERIORLY, 4TH
PAIR ANTERO-LATERALLY

5. THE 5TH
POSTERO-LATERALLY. BLOOD FROM PERICARDIAL SINUS ENTERS
THE HEART THROUGH THESE OSTIA.
IN A SECTION, CAVITY OF HEART APPEARS SPONGE-LIKE, FILLED WITH
NUMEROUS INTERLACING MUSCLEFIBERS ANDBLOODINTHE INTERSPACES.
ARTERIES
ARTERIES ARE THICK, STRONG AND MUSCULAR TUBES ARISE FROM THE
HEART AND SUPPLY BLOOD IN DIFFERENT PARTS OF THE BODY. PRINCIPAL
ARTERIES ARE THE FOLLOWING:
(A) MEDIAN OPTHALMIC ARTERY
ITISASINGLEMEDIANCEPHALICOROPTHALMICARTERYARISINGFROMTHE
APEX OF THE HEART. IT RUNS FORWARD, MID-DORSALLY ALONG THE RENAL
SAC TO SUPPLY BLOOD TO THE OESOPHAGUS, CARDIAC STOMACH AND
HEAD. IT JOINS THE TWO ANTENNARY ARTERIES ABOVE OESOPHAGUS.

6. (B) ANTENNARY ARTERIES
A PAIR OF LATERAL CEPHALIC OR ANTENNARY ARTERIES ARISES FROM THE
APEX OF THE HEART, ONE ON EACH OUTER SIDE OF MEDIAN OPTHALMIC
ARTERY.
EACH ARTERY RUNS FORWARD OBLIQUELY AND IS BRANCHED INTO
DIFFERENT ARTERIES. A PERICARDIAL BRANCH TO CARDIAC STOMACH AND
A MANDIBULAR BRANCH TO MANDIBULAR MUSCLE.
THEN IT BIFURCATES INTO A DORSAL AND A VENTRAL BRANCH. THE
VENTRALBRANCHFURTHERDIVIDESTOSUPPLYTHEANTENNULE,ANTENNA
AND RENAL ORGAN.
THE DORSAL BRANCH GIVES OFF TWO SUB BRANCHES, THE OUTER ONE IS,
OPTIC ARTERYSUPPLIES TOTHEEYESANDTHEINNER ARTERYWHICHMEETS
ITS FELLOW OF THE OPPOSITE SIDE AND THE MEDIAN OPTHALIMIC ARTERY
FORMINGCIRCULUSCEPHALICUS.APAIROFROSTRALARTERIESARISEFROM
THE CIRCULUS CEPHALICUS TO GO TO ROSTRUM.

7. (C) HEPATIC ARTERIES
THESEARTERIESARISEFROMVENTROLATERALSIDESOFTHEHEART,ONEON
EACH SIDE JUST BEHIND THE ANTENNARY ARTERY. EACH RAMIFIES INTO
CAPILLARIES IN THE HEPATOPANCREAS.
(D) MEDIAN POSTERIOR ARTERY
A SHORT, STOUT MEDIAN ARTERYARISES FROM THE POSTERO-VENTRAL SIDE
OF THE HEART. IMMEDIATELY IT BIFURCATES INTO TWO ARTERIES.
1. SUPRAINTESTINAL OR DORSAL ABDOMINAL ARTERY
IT RUNS BACKWARD ALONG THE DORSAL SURFACE OF THE INTESTINE UPTO
THE HIND GUT. IT SUPPLIES BLOOD TO INTESTINE AND ABDOMINAL
MUSCLES.

8. 2. THE STERNAL ARTERY
IT RUNS OBLIQUELY DOWNWARDS AND PASSES THROUGH AN APERTURE IN
THE VENTRAL THORACIC GANGLIONIC MASS.
ON REACHING THE VENTRAL SIDE IT BIFURCATES INTO TWO
(A) THE VENTRAL THORACIC ARTERY RUNS FORWARD AND SUPPLIES BLOOD
TO THE STERNAL REGION OF THE THORAX,
(B) THE VENTRAL ABDOMINAL ARTERY RUNS BACKWARDS AND SUPPLIES
BLOOD TO THE VENTRAL ABDOMINAL REGION.
BLOOD LACUNAE
MAIN ARTERIES DON’T TERMINATE INTO FINE CAPILLARIES IN VARIOUS
ORGANS; INSTEAD THEY OPEN INTO BLOOD LACUNAE OF THE HAEMOCOEL.
ASTHEREARENOVEINSINTHEPRAWN,THESELACUNAEJOINONEANOTHER
AND FORM A PAIR OF LARGE ILL- DEFINED VENTRAL SINUSES, SITUATED
BELOW THE HEPATOPANCREAS AND MUSCLES OF THE THORAX. THE TWO
VENTRAL SINUSES COMMUNICATE WITH EACH OTHER AT VARIOUS PLACES.

9. BLOOD CHANNELS
FROM VENTRAL SINUSES, BLOOD IS CARRIED OUT TO THE GILLS ON EACH
SIDE THROUGH SIX AFFERENT BRANCHIAL CHANNELS.
THE CHANNELS ARE LACUNAR TUBES WITHOUT PROPER WALLS. THE
SINUSES AND CHANNELS COMPRISE THE OPEN PORTION OF CIRCULATORY
SYSTEM. FROM THE GILLS THE OXYGENATED BLOOD IS CARRIED TO THE
PERICARDIUM BY SIX EFFERENT BRANCHIAL CHANNELS.

10. BLOOD AND ITS COURSE OF CIRCULATION
BLOOD IS A COLOURLESS THIN FLUID CONTAINING WHITE CORPUSCLES OR
LEUCOCYTES AND A DISSOLVED RESPIRATORY PIGMENT HAEMOCYANIN.THE
METAL COMPONENT OF HAEMOCYANIN IS COPPER AND IT TURNS BLUE
WHEN IT COMBINES WITH OXYGEN. BLOOD OF PRAWN SHOWS CLOTTING
PROPERTIES.THE CIRCULATION OF BLOOD STARTS FROM THE PUMPING
ACTION OF THE HEART. THE HEART BY MEANS OF ITS RHYTHMIC
CONTRACTION PUMPS BLOOD INTO THE ARTERIES, WHICH DISTRIBUTE IT TO
ALL PARTS OF THE BODY. AFTER PASSING THROUGH GILLS AND DIFFERENT
CHANNELS BLOOD RETURNS BACK INTO THE HEART.

12. THANKYOU….