For the most part primates are classified quadrupedal. Primates travel in methods of brachiation, vertical clinging and leaping, knuckle walking, and bipedalism for modern man. Through natural selection and evolution primates developed an increase of hair density changes in body configuration and have shifted to having a gradual upright stance. Grade I-Lemurs The first grade of primates came in the Paleocene epoch, about 65 million years ago. It is the most primitive, and it includes true lemurs, galagos and lorises.
Hassan’s Story A. Baru is using surface markings to identify the gender of a skull. What two major types of surface markings do bones have? a. The two major types of surface markings do bones have are the depression and openings. These include fissure, foramen, fossa, sulcus, meatus, process, condyle, facet, head, crest, epicondyle, line, spineous process, trochanter, tubercle, and tuberosity.
There was a minor mass extinction toward the end of the Jurassic period. A stegosaurus had a large, flat, bony, triangular plates along its back . As well as a heavy, spiked tail for protection. A stegosaurus also had a very small head with a tiny brain and toothless beak . Their brain size can be compared to a size of a walnut.
The peritoneal cavity in a human abdomen is one part of our coelom, and there are similar spaces around our heart and lungs. Coelom formation begins in the gastrula stage. The developing digestive tube of an embryo forms as a blind pouch called the archenteron. In protostomes the coelom forms by a process known as schizocoelous. The archenteron initially forms, and the mesoderm splits into two layers: the first attaches to the body wall, and the second surrounds the endoderm forming the visceral layer or alimentary canal.
the relationship beetween the angles of the pelvis and the spine provides evidence that hominids evolved from a hunched walk to an upright walk. This allowed them to reach more fruits and travle more efficiantly. When looking at the bone structure of a hominids hand there is evidence of elongated filangies, which are good for climbing. There is also evidence of calliced palms, similar to modern apes, which were good for use on rough surfaces like trees and rocks. The short legs of early hominids were not efficiant for long distance walking nor running at higher speeds.
Her skeleton includes her skull, teeth, arms, hands, pelvis, legs, and feet. She stood at almost 4 feet tall and weighed about 110 pounds, similar in size to a chimpanzee. She had a short, broad pelvis with a long, curved spine like modern humans. She had long arms, short legs, and a relatively small, chimp-sized brain. Her upper arm bone was non weight-bearing, and her wrist and finger joints were highly flexible, unlike chimps and gorillas that have rigid joints for knuckle walking.
A surface marking that can distinguish left from right, is the medial epicondyle. When positioning a skeleton in the anatomical position the epicondyle should be medial to the trunk and proximal to the ulna. D) Why would Stefan think that an enlarged right deltoid tuberosity might indicate right- handedness? The reason Stefan would assume the skeleton of the young princess was right-handed was to an enlarged right deltoid tuberosity. An enlarge tuberosity indicates that the tendons that were once attached were worked more than the opposite arm.
They are s-shaped, long, slender bones that lie horizontally across the anterior part of the thorax superior to the first rib. C. Which surface markings could Stefan use to distinguish the right humerus from the left? Stefan could find the coronoid fossa which would indicate that if it is the right or left due to it only being on the anterior side of the bone. Also by recognizing their landmarks such as the head, deltoid tuberosity, and the olecranon fossa D. Why would Stefan think that an enlarged right deltoid tuberosity might indicate right-handedness? The deltoid tuberosity serves as an attachment for the tendons of the deltoid muscle, when you use one arm and hand much more than the other the bone will make that attachment site stronger to ensure adequate use and reduce the risk of harming that tendon, bone, or muscle E. What is the location of the pubic symphysis Stefan refers to in the story?
Its head is massive with a bulging forehead and prominent sagittal crest on top. Like humans, their mouth is fit with 32 teeth. However, they are much larger and stronger than humans, fit to grind the coarse vegetation they eat. They do experience a similar “two-set” system, losing the first set of baby teeth to be replaced by a permanent set as an adult. But where do all of these attributes come into play?
Shanakay Campbell 10/30/2014 A&P2530 Hassan’s Story A. Which clue would tell Stefan which scapular surface was anterior and which was posterior? What is the name of the shallow, oval socket of the scapula that Stefan placed next to the humerus? A: The scapula is a large triangular, flat bone situated in the superior part of the posterior thorax. A prominent ridge called the spine runs diagonally across the posterior surface of the scapula.