Which vertebrates lacks a bony spine

Being mammals, pikas are vertebrates - they have a bony spine. Toads are vertebrates as they have an internal bony skeleton and a spine backbone. Yes, it has a bony spine.

The bony segments of the spine is the vertebrae. Platypuses are vertebrates, meaning that they have a spine. All mammals are vertebrates. Vertebrates hae bony internal skeletons. The spinal vertebrate can be defined as the vertebral column which is also known as the backbone or spine. It is a bony structure found in vertebrates. It is formed from the vertebrae. All crocodiles reptiles are vertebrates as they have an internal bony skeleton and a spine.

Vertebrates have a spine, while invertebrates do not. Since birds have a spine, they are considered a vertebrate. Cats are vertebrates because they have a spine. Vertebrates are animals that have backbones. An invertebrate is an animal that has no spine.

Snails have a shell, but no spine. Butterflies have an exoskeleton, but no spine. The defining characteristic for all vertebrates is a spine, so neither snails or butterflies are vertebrates.

Parrots have a spine, so they are vertebrates. Ostrich's are vertebrates as they have a spine. Lions are mammals, and are vertebrates as they have a spine. Jaguars are vertebrates as they have a spine. Dogs are vertebrates as they have a spine. All vertebrates have bony or cartilaginous skeletons. They are vertebrates. Log in. Study now. See Answer. Invertebrates lack any internal skeleton.

Snails have a shell, but no spine. Butterflies have an exoskeleton, but no spine. The defining characteristic for all vertebrates is a spine, so neither snails or butterflies are vertebrates. Squirrel monkeys are vertebrates because they have a spine. Vertebrate animals have spines. Invertebrate animals lack spines.

Parrots have a spine, so they are vertebrates. Ostrich's are vertebrates as they have a spine. Log in. Animal Life. Skeletal System. Study now. See Answer. Best Answer. Study guides. Where are in the animal nutrition in M P. Genetics 20 cards. What is evolutionary theory. What are the tough leathery eggs of reptiles and birds called. What kind of mammals lay amnionic eggs.

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Q: Which vertebrates lack a bony spine? Write your answer Related questions. What vertebrates lacks a bony spine? Are turkeys vertebrates? Are crocodias a invertabrate? What do non-vertebrates lack of? Is the fish is veribrate? Turtles are vertebrates or invertebrates? Is an American pikas a vertebrate or an invertebrate? An interesting anatomical fact is that almost all mammals have seven cervical vertebrae, regardless of body size. This means that there are large variations in the size of cervical vertebrae, ranging from the very small cervical vertebrae of a shrew to the greatly elongated vertebrae in the neck of a giraffe.

In a full-grown giraffe, each cervical vertebra is 11 inches tall. When the load on the spine is increased, by carrying a heavy backpack for example, the curvatures increase in depth become more curved to accommodate the extra weight. They then spring back when the weight is removed.

Disorders associated with the curvature of the spine include kyphosis an excessive posterior curvature of the thoracic region , lordosis an excessive anterior curvature of the lumbar region , and scoliosis an abnormal, lateral curvature, accompanied by twisting of the vertebral column. Developmental anomalies, pathological changes, or obesity can enhance the normal vertebral column curves, resulting in the development of abnormal or excessive curvatures Figure 6.

Kyphosis, also referred to as humpback or hunchback, is an excessive posterior curvature of the thoracic region. This can develop when osteoporosis causes weakening and erosion of the anterior portions of the upper thoracic vertebrae, resulting in their gradual collapse Figure 6.

Lordosis, or swayback, is an excessive anterior curvature of the lumbar region and is most commonly associated with obesity or late pregnancy. The accumulation of body weight in the abdominal region results an anterior shift in the line of gravity that carries the weight of the body. This causes in an anterior tilt of the pelvis and a pronounced enhancement of the lumbar curve. Scoliosis is an abnormal, lateral curvature, accompanied by twisting of the vertebral column.

Compensatory curves may also develop in other areas of the vertebral column to help maintain the head positioned over the feet. Scoliosis is the most common vertebral abnormality among girls.

The cause is usually unknown, but it may result from weakness of the back muscles, defects such as differential growth rates in the right and left sides of the vertebral column, or differences in the length of the lower limbs. When present, scoliosis tends to get worse during adolescent growth spurts. Although most individuals do not require treatment, a back brace may be recommended for growing children. In extreme cases, surgery may be required. Osteoporosis is a common age-related bone disease in which bone density and strength is decreased.

Watch this video to get a better understanding of how thoracic vertebrae may become weakened and may fracture due to this disease. How may vertebral osteoporosis contribute to kyphosis? Within the different regions of the vertebral column, vertebrae vary in size and shape, but they all follow a similar structural pattern.

A typical vertebra will consist of a body, a vertebral arch, and seven processes Figure 6. The body is the anterior portion of each vertebra and is the part that supports the body weight. Because of this, the vertebral bodies progressively increase in size and thickness going down the vertebral column. The bodies of adjacent vertebrae are separated and strongly united by an intervertebral disc.

The vertebral arch forms the posterior portion of each vertebra. It consists of four parts, the right and left pedicles and the right and left laminae. Each pedicle forms one of the lateral sides of the vertebral arch. The pedicles are anchored to the posterior side of the vertebral body.

Each lamina forms part of the posterior roof of the vertebral arch. The large opening between the vertebral arch and body is the vertebral foramen , which contains the spinal cord. In the intact vertebral column, the vertebral foramina of all of the vertebrae align to form the vertebral spinal canal , which serves as the bony protection and passageway for the spinal cord down the back. When the vertebrae are aligned together in the vertebral column, notches in the margins of the pedicles of adjacent vertebrae together form an intervertebral foramen , the opening through which a spinal nerve exits from the vertebral column Figure 6.

Seven processes arise from the vertebral arch. Each paired transverse process projects laterally and arises from the junction point between the pedicle and lamina. The single spinous process vertebral spine projects posteriorly at the midline of the back.